Radio Shack
Fort Worth, Texas, USA

Known also as Tandy outside North America, Radio Shack has sold many OEM calculators and pocket computers since the early years.

Their impressive lineup included machines from Casio, Sharp, Sinclair and Texas instruments; they also sold pocket computers under their popular TRS-80 label, machines that were in fact relabelled products from Casio and Sharp.

Source : R/S Programmable calculators