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Addendum to 'The Collector's Guide to Pocket Calculators'
"T–Z"

The Collector's Guide to Pocket Calculators lists over 1,500 models of early pocket calculators from over 220 companies and provides an excellent source of information on early hand-held calculators.  However, since it was published further models have come to light and are listed here.

If you have an early pocket calculator (from the 1970s with LED, vacuum fluorescent, discharge, or early LCD display, and battery powered) which is not in The Collector's Guide, please email the details as in the list below for inclusion here.

Details for each calculator are required in the format used in the book, and below:
Manufacturer or Trading Company, Model Name or Number (there may be more than one), Functions, Display Type, Battery type (and if rechargeable), Size, Country of Manufacture, any Interesting Features.

A small frontal photograph (jpeg format, about 600 pixels max dimension) of each would be useful and will be included with the details if of good quality.
Please email with details.

New Calculators

Latest Update - latest additions have the date added.

Displays are 8-digits unless described otherwise.

Go to   T   U   V   W   X   Y   Z

 

T

T 600 (May just be the model number)

T Research (Italian company?)

Tabulex (Euro-market company. May have had a connection with Hanimex.)

Taktile (Made in England by Advanced Telecommunications Equipment Ltd. (ATE).)

Tamaya (Japanese scientific instrument maker)

Tandy (Tandy Corporation was the parent company of Radio Shack.  Calculators were sold under the Tandy name in Europe and Australia.  See the corresponding calculator under Radio Shack.)  The following models are known labelled 'Tandy'.

TATEX

TATRON

Tatung (Taiwanese electrical and electronics company)

TC (probably not the name of the company. If you have any information please get in touch)

TEAL  (T.E.A.L. stands for Tokyo Electron Applications Laboratory, of Tokyo, Japan, which made and sold calculators under the TEAL name.  TEAL Industries Inc., of Carson, California, was the U.S. subsidiary.  For more information see the Calculator Companies section).

TEALTRONIC (British marketing company which specialised in TEAL calculators, High Road, London N12)

TEC (Taihan Electric Wire Co., Ltd., Korea)

Technico

tecnosonic

TECO (Tongyuan Electric and Machinery Co., Ltd., Taiwan

tee (TRANS EUROPEAN ELECTRONICS)

TEKNIKA GENERAL See General

TEKTRON

TEL

Tel-Exec

Texas Instruments (USA manufacturer) (See Larry Gilbert's article "Texas Instruments Calculators: 1972 - 1979 How rare are they?" on this site. There are details of all vintage Texas Instruments calculators at www.datamath.org)

Texatron

Texet

TG&Y

Tik-Tron

Timex

TKC (Tokai Communication Industry Co. Ltd., Japan)

TKS 2002 (TKS Corporation, Los Angeles, California, U.S.A.)

Tohotronic  (Toho Tsusho Co. Ltd., Japan)

Tokai (TOKAI COMMUNICATION INDUSTRY CO. LTD)

Tokatron

Toko

Tokyo Electron Applications Laboratory - See TEAL

Tom Thumb

Topaz

TOP CREST

TOPIA

TOP STAR

Toshiba (Tokyo Shibaura Electric Co. Ltd, Tokyo, Japan.  See also calculators under the 'Homeland' label which were marketed by the separate Toshiba Business Machine Co., Ltd., a company in the Toshiba group.)

TOSMAC

totSonic

TOVSON

TRANSIMPEX

Transonic (we have no information about this company. If you can help please get in touch.)

trend

Tricom

Tri-Star

Triton - Triton was a registered trademark of Radofin Electronic.  See Radofin.  Some Triton models are similar to Taktile models.

Triumph (European market calculator, same company as Adler, many models the same, some sold as "Triumph-Adler")

TRONICA

TRQ (Spanish manufacturer)

TRS (Tvornica Računskih Strojeva, translates to Computing Machinery Factory.  Croatia, ex-Yugoslavia)

Tryom (U.S. company)

TSI (Telemetry Systems Inc.) (U.S. company)

T Research

 

U

UDM (see Universal Data Machine)

UIT

Unico (The instruction booklet of H-803A says "Wah Chang Group of Companies.  Manufactured by United Electronic Engineering Corp."  Wah Chang Corporation is a manufacturing company based in Albany in the U.S. state of Oregon.  United Electronic Engineering Corp. is a Singapore company.)

Unicom (U.S. company) (also see Rockwell)

Unifive Industries Corporation (Marietta, Georgia, USA).

unigran

UniMark (marked Interpur PO Box 2353 Orlando Fla. USA).

Union Carbide (U.S.A. chemical company).

Unisonic Note: many Unisonics had a number on the front (911L) and a variation number on the back (911L-A). Often there was a difference in the features or keys of the model from another variation of the same basic model number.

Unitra Eltra (Polish company)

Unitrex (EIKO Business Machine Co., Ltd., Tokyo, Japan)#

Universal (IEE (Industrial Electronics & Engineering Ltd.), Singapore.  European market calculators)

Universal Data Machine (UDM) (Chicago, U.S.A.)

Unknown Manufacturer (if you have any information about the manufacturers and model numbers please get in touch)

Unser Favorit (European market calculator)

Uranus

U-Tac

 

V

VAICA

Vanguard (Made in Spain by Cahué Industrial S.A., Barcelona)

Vanity Fair

VANWARD

Ventora (The box has "Ventora by Gratton".  Gratton is a British catalog sales company.)

Ventron

Verax

Vic (Mexican company)

Victor Comptometer (U.S. company)

Victron Electronics Corp (Taipei, Taiwan)#

VIDEOMASTER (Waddington Videomaster Ltd., London, England)

VINESS

Vista

Vito (Swiss company)

Vornado (Vornado Inc., Garfield, N.J., U.S.A.)

Voesa

VOLTMATIC

Vornado

 

W

WALTONS

Walther (German company)

Weltelektrik (If you have any details of the company please get in touch)

Wentworth

Western Auto (U.S. company)

Westra

Whitehall

Winthronics (We have no details about this company, though it is probably British. If you have any information please get in touch).

Wintron

 

X

XAM (Brand name of own label electronic devices sold through the Korvettes department store chain, with headquarters in New York, U.S.A.)

Xonex Corporation Ltd. (Toronto, Canada)

 

Y

Yashica

YEMCO

 

Z

ZENITH

Zeny

 

 

Click to go to :
Calculator Book Addendum A-B
Calculator Book Addendum C-D
Calculator Book Addendum E-I
Calculator Book Addendum J-O
Calculator Book Addendum P-R
Calculator Book Addendum S

 

Key to Abbreviations

Functions:
4-funct = 4 basic mathematical functions (addition, subtraction, multiplication, division)
sci-funct = scientific or engineering functions (logarithmic and trigonometric functions such as log, sine, and cosine and usually memory, square, pi, etc.)
mem = memory
% = percent function
exp = exponent
paren = parentheses
pi = pi value
recip = reciprocal
sgn chg = sign change
sq rt = square root
sq funct = square functions (including square and square root)

Battery Type:
button rep batt = very small, disk-shaped, replaceable batteries commonly termed button-types, used mainly in LCD models.
rep batt = replaceable batteries (such as 9V, AA, C, and N batteries)
rep batt pack = replaceable batteries in a removable pack
sealed batt = rechargeable batteries sealed in the case
sealed batt pack = rechargeable batteries in a removable pack

Display Type:
See the section on Calculator Displays for more detailed information.
Displays have 8 digits unless specified otherwise.

COS-LCD = Early Liquid Crystal Display from Sharp showing silver digits on a dark background. COS stands for Crystal on Substrate. This display was used as early as October 1973 but eventually was phased out.
fluor = see VFD.
Gas discharge = Display containing all digits sealed in a single package employing  gas discharge to generate light in the same way as a neon lamp. Normally give amber- or orange-colored digits, and typified by the Panaplex® used by a few calculator manufacturers.
LCD = Liquid Crystal Display, a flat, gray-digit type of display type that uses less power and was embraced by calculator makers by the end of the 1970s. Early versions (used in the early 1970s) by Rockwell and Sharp are included in this guide.
LED = Light Emitting Diode display (usually red although sometimes a purple filter was used to color the display). LEDs often have small half bubble-like covers over the digits. tube or mini-tube = separate vacuum or fluorescent tube for each digit of display.
Yellow LCD = Early LCDs had a reliability problem with ultra-violet light and manufacturers used a yellow-colored filter over the normally gray display to remedy that. Refinements in later LCD designs removed the need for the filter.
VFD = Vacuum Fluorescent Display. Display containing all digits sealed in a single tube generating light from an electrical discharge onto a fluorescent material. The color of the digits is normally green or blue, or somewhere in between.

Other Information:
Klixon keypad = Texas Instruments Klixon® keypad was one of the earliest keypads and used greatly by Bowmar and a few other early calculator makers. It had the four basic functions and used metal key pads about 1/2" square.
Japan (for example) = country of manufacture as stated on calculator
RPN = Reverse Polish Notation, a method of calculating and user data entry used by HP calculators. A few other manufacturers also used RPN in more limited scale.
"aka" (also known as) is used when there is another name or model variation on the calculator.
"c" (for example, c1973) is used as "circa," denoting at approximately that time.

 

A big thanks to Thomas Brockmeier, Richard Brooks, Andrew Davie, Larry Gilbert, Niels Grot, Palmer Hanson, Steve Haynes, Robert King, Kent King, Jeff Lane, Philippe Leckler, Ken Meine, Bob Patton, James Redin, and CB Wilson for their help.

 

How to Buy the Book!!!!

Collector's Guide to Pocket Calculators

by Guy Ball and Bruce Flamm

This 204 page, softcover book is the world's most comprehensive listing of electronic pocket calculators from the 1970's, the so-called Golden Age of Pocket Calculators. Over 1,500 known calculators are detailed with information on features, size, display type, power type, and pricing. In addition, when known, the listing also contains date of sales, original pricing, and country of origin information.

The book features over 470 photographs of various models from over 240 manufacturers around the world (including calculators from lesser-known companies in England, Switzerland, Netherlands, Spain, Germany, Bulgaria, and Russia).

"The Collector's Guide to Pocket Calculators" includes a comprehensive value guide to help you gauge rarity and desirability of the various models -- especially as they relate to each other.

The book can be purchased for $23.95 plus $4 for USA first class mailing ($2 for US mailing via slower book rate, $6 for first class mailing to Canada and Mexico, and $8 for airmail to other countries). California residents please add $1.86 state sales tax.

!!!! SPECIAL OFFER !!!!

As a special offer, mention this page (newcalc1) and deduct $4 off the price of the book. This offer is only valid if you mention this page. We're trying to see how many people actually read this. If you do, it is a great way to get a great price on a great book!!

Mail to:
Wilson/Barnett Publishing
P.O. Box 345, Tustin, CA 92781-0345, USA
For additional information, contact co-author Guy Ball for additional details and purchase information.

 

Copyright ©1997 Guy Ball and Bruce Flamm, ©2002-2020 Nigel Tout

Vintage Calculators

© Text & photographs copyright Nigel Tout   2000-2020  except where noted otherwise.