Radio Shack (a Tandy Corporation company, Fort Worth, Texas, U.S.A. See also Tandy.)

Radio Shack EC-100.

Radio Shack EC-200, inside.

Radio Shack EC-220. Featured calculator.

Radio Shack EC-225 (type 1, red LED).

Radio Shack EC-225 (type 2, yellow LCD) "Statesman Thin LCD", rear. Details.

Radio Shack EC-226

Radio Shack EC-281.

Radio Shack EC-312 "ASTRO", astrological calculator (photo in "Astro" mode).

Radio Shack EC-350.

Radio Shack EC-415.

Radio Shack EC-475.

Radio Shack EC-490.

Radio Shack EC-4001 has 'pregnant' bulge for battery, photo of bulge on rear of calculator and shaped support tray. Featured on British calculator site.

Radofin (Radofin Electronics (F.E.) Limited, Kowloon, Hong Kong. London office: King Street, London, W6. Triton was a registered trade name of the company).

Radofin 8P.

Radofin 870

Radofin 1000 "Triton". Details.

Triton 1200, resembles Taktile 1200. Featured on British calculator site.

Radofin Triton 1400. Featured on British calculator site.

Radofin 1515. Featured on British calculator site.

Radofin 1610 "Valuman". Featured on British calculator site.

Radofin 1640. Details.

Radofin 1660. Featured on British calculator site.

Radofin 1720.

Radofin 2055, rear. Details.

Radofin 2200, style 1.

Radofin 2200, style 2.

Radofin 2500. Details.

Radofin 2560.

Rambler (Apparently a brand name of an Australian marketing company)

Rambler. Details.

Ramsgate (Ramsgate Inc., Eveleth, Minnesota, U.S.A.)

Ramsgate M-11. This calculator features in the "One Hit Wonders" article.

RandS

RandS 810N. Details.

Rapid Data (See the Calculator Companies section for more information.)

Rapid Data Rapidman 800, also available in green and in cream. Featured calculator.

Rapid Data Rapidman 801.

Rapid Data Rapidman 812.

Rapidex

Rapidex 710.

RBM (U.S. company)

RBM Scientific, inside. This calculator features in the "One Hit Wonders" article.

Realtone (Euro-market company)

Realtone Conversion Master KP-60, inside. Details.

realtone KP-470.

Regan (Regan Industries, Glendale, California, U.S.A.)

Regan RA900P. This calculator features in the "One Hit Wonders" article.

Remington - See Sperry Remington

Reno (German company)

Reno 952. Details.

RES (Radient Energy Systems, U.S.A.)

RES Mark IX. Featured calculator .

Revtronic (We have no information about this company. If you can help please get in touch with us.)

No model number on calculator but the original box calls it the 'REVTRONIC GRADUATE CALCULATOR'. Details .

Rex

rex 8. Details .

RFT (East German (DDR) company)

RFT konkret 100. Details.

RFT konkret 100 and konkret 200 models. Details.

RFT konkret 400 and Elektronika b3-19M. Details.

RFT minrex 75. Featured calculator .

RFT MR201, inside.

Ricoh (Japanese company)

Ricoh RC-8A.

Ricoh RC-8F.

Ricoh RC-8L

Ricoh Ricomac X-10.  Details.

Ricoh Ricohmac 1213 (model 7471-22), inside. Details.

RJP

RJP 880. Featured calculator .

RMS International

RMS International Zeta 7.

Rockwell (USA company, started as calculator IC maker. Also sold calculators under the names Anita and Unicom. See the Calculator Companies section for more information.)

Rockwell 8R. Featured calculator .

Rockwell 9TR. Featured calculator .

Rockwell 10R.

Rockwell 14RD.

Rockwell 14RD II.

Rockwell 18R.

Rockwell 18T. Details.

Rockwell 20R.

Rockwell 20T. Details.

Rockwell 21R.

Rockwell 22K.

Rockwell 22MS.

Rockwell 24K II, inside.

Rockwell 24RD

Rockwell 24RD II.

Rockwell 30R.

Rockwell 31R.

Rockwell 44RD.

Rockwell 51R "Converter"

Rockwell 61R.

Rockwell 63R.

Rockwell '76 (calculator made to celebrate USA bicentennial in 1976).

Rockwell 202 Slide Rule.

Royal (Originated as the Royal Typewriter Company, U.S.A, later one of the Litton Industries companies which included Imperial, Triumph and Adler)

Royal 80K, very small but chunky calculator.

Royal 81M, very small but chunky calculator.

Royal 81SN. Details.

Royal 90S.

Royal Award GT8.

Royal Countess Royal.

Royal Digital III, inside 1, inside 2, highly unusual 4-digit tube display, operated using a stylus. Featured calculator .

Royal Digital IV, inside1, inside2, 8-digit LED version of the Digital III. Featured calculator.

Royal Digital V. Featured on British calculator site.

Royal Digital 5-M (Appears to be the same as the Royal Award GT8). Featured on British calculator site.

Royal Digital 5-T. Featured on British calculator site.

Royal Digital 88M.

Royal Five GT. Featured on British calculator site.

Royal Mini Five. Featured on British calculator site.

Royal RC-80.  Details.

Royal RC-84. Details.

Royal RC-87. Details.

Ruby (NEC (Nippon Electric Company), Japan.  Any connection with the Ruby calculators from Sola Enterprise, below, is not known.)

Ruby HM-80D, rear. Details.

Ruby (Sola Enterprise Co., Ltd., Taiwan.  May be labelled "Advance Electronics Co., Ltd." on the back and not to be confused with the British company "Advance Electronics Ltd."  Any connection with the Ruby calculators from NEC, above, is not known.)

Ruby 800, inside, this example labelled "Advance Electronics Co., Ltd.". Details.

Ruby 800M, this example marketed by Sola Enterprise Co., Ltd. Details.

Ruby Super Mini 800, this example labelled  "Advance Electronics Co., Ltd.". Details.