Hand-held, modern programmable calculator. Equipped with three memory modules and a card reader (detachable) for magnetic program cards. Three instruction manuals. Brown, synthetic leather, soft case. Additional accessories, added after original purchase by owner, are a quad density memory module, and a navigation module with manual for use in celestial navigation. A timer module accessory for the HP-41C was donated, to be included with the set, after the donation of the calculator in 1988. H.P.-41C, ser. no. 1939-A-01142
