Texas Instruments slide rule calculator SR-51A Owner’s Manual + Operating Guide

Texas Instrument SR-50A Slide Rule Calculator – 1975 Manual Only

Texas Instrument Super Slide Rule Calculator SR-51A

Texas Instruments SR-51A Super Side Rule Calculator w AC Adapter Manual Case

Texas Instruments Slide Rule Calculator SR-50A Booklet (1975)

Texas Instruments SR-50A Slide Rule Calculator with Case and Charger

Texas Instruments SR-50 Scientific Calculator Vintage 1973 Slide Rule With Case