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

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). Jan 11.

Radio Shack EC-350. Oct 11.

Radio Shack EC-415. Oct 11.

Radio Shack EC-475. Oct 12.

Radio Shack EC-490.

Radio Shack EC-4001. Featured calculator.

Radofin (British marketing company - Triton was a registered trade name of the company. See the British Calculators section.)

Radofin 8P. Oct.12.

Radofin 870

Radofin 1000 "Triton". Details.

Triton 1200, resembles Taktile 1200. Featured British calculator.

Radofin Triton 1400. Featured British calculator.

Radofin 1515. Featured British calculator.

Radofin 1610 "Valuman". Featured British calculator.

Radofin 1640. Details.

Radofin 1660. Featured British calculator.

Radofin 1720. Dec 11.

Radofin 2200, style 1.

Radofin 2200, style 2.

Radofin 2500. Details.

Radofin 2560. Dec 11.

Rambler (please get in touch if you have any information about the company)

Rambler. Details.

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

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

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. Oct 12.

Rapidex

Rapidex 710. Oct 11.

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. Details.

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.)

Revtronic (no model number). Details.

Rex

rex 8. Details.

RFT

RFT konkret 100. Details. Oct 11.

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

Ricoh RC-8A.

Ricoh RC-8F.

Ricoh RC-8L

Ricoh Ricomac X-10.  Details.

RJP

RJP 880. Featured calculator.

RMS International

RMS International Zeta 7. Oct 11.

Rockwell (USA company, started as calculator IC maker. Also sold calculators under the names Anita and Unisonic. 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. Oct 11.

Rockwell 24K II, inside.

Rockwell 24RD

Rockwell 24RD II.

Rockwell 30R.

Rockwell 31R.

Rockwell 44RD.

Rockwell 51R "Converter"

Rockwell 61R.

Rockwell 63R.

Texas Instrument TI-76 and Rockwell '76 (Calculators made to celebrate USA bicentennial in 1976)

Rockwell 202 Slide Rule.

Royal (Royal Typewriter Company. U.S. company, distributed in Britain by Imperial Typewriter Company, both Litton Industries companies)

Royal 5HPD

Royal 80K, very small but chunky calculator.

Royal 81M, very small but chunky calculator.

Royal 90S.

Royal Award GT8. Oct 11.

Royal Countess Royal. Oct 11.

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 British calculator.

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

Royal Digital 5-T. Featured British calculator.

Royal Five GT. Featured British calculator.

Royal Mini Five. Featured British calculator.

Royal RC-84. Details.