The HP-41 family card reader (HP82104A) is a very useful accessory for storing and retrieving programs and data. The card reader presented here is in excellent condition, in original box with its manual. The device is recognized by the calculator as seen in the images. It comes with a number of used cards which will be very useful when testing it.
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Another beautiful vintage desktop calculator: Monroe 325 Scientist. This is a programmable desktop calculator, it has a printer included and it also has a cassette interface which allows connection to a Monroe 392 tape recorder.
The Wang 450 desktop calculator is one of the last large calculators made by Wang. The 400 family was the last series of calculators made by Wang and the 450 Scientific is one of the series.
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This pair of Casio watch calculators were manufactured sometime in the 1980s. They are models CA-501 and CA-502.
The HP-41 Blanknut version is a variant of the HP-41CV made by HP for customers who needed to sell the calculator bundled with their own software.