Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
Slide Adder
Four Misc. All-Metal Slide Adders
USA and Germany
Adding and Subtracting

Notes: "These four all-metal slide adders are one step above the plastic-and-metal slide adders which were primarily novelties, not for serious work. The adders are:
The Tower 9, made by Addimult (an Addiator competitor) to be sold by someone else, possibly Sears.
The Tasco Pocket Arithmometer. This is the Gray’s Arithmometer after Tasco (Tavela Sales Co., not the other Tasco that sells telescopes) bought them out.
The Baby Calculator is providing our dose of art deco styling for the day.
The Addiator Duplex is in a folding leather (or good imitation) case, with original notepad."

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Image 6