Monroe LX-160 Adding Machine
Monroe LX-160 Adding Machine circa 1950
The Monroe Model L is a spunky little mechanical calculator with surprising power for its size. Sporting a full keyboard (i.e. a column of keys from 0 to 9 for each digit) and a mobile carriage (for rapid multiplication/division), this 'miniaturized' calculator enjoyed an impressive 40 year production span from the 1920s through the 1960s.
Monroe LX-160 Adding Machine circa 1950.
The body measures only about 6 x 8 inches.
The underside has a plate "BELDEN MFG CO. No. 17620"
I suspect that Belden was the purchaser/owner rather than the manufacturer.
The rear legs are shown retracted into the body for portability.
Plate shows Model LX-160 SN 525102
Video of how to open the cover of the Monroe Model L
The carriage underside of the Monroe Model L
The carriage is easily removed by unscrewing and withdrawing the pivot rod (not shown).
Below is a video - made by citroen2cv - of the Monroe in action:
Video of the Monroe Model L160-X (source Citroen2cv)
Monroe Calculator Model LX-160
Also check out the Friden C10.