A power supply and an instruction booklet are also included.Īccording to Ball and Flamm, the MX55 sold in 1974 at a list price of $69. The box holds not only the calculator but a black zippered sleeve marked: Bowmar. The calculator is in a cardboard case marked: MX55 Five Function (/) Eight Digit Rechargeable Batteries (/) Electronic Calculator (/) The Bowmar Brains (/) Bowmar/ALI, Inc., 531 Main Street, Acton, Massachusetts 01720.
#Bowmar engineering calculator serial
It also reads in part: BOWMAR MODEL MX55 SERIAL NO. It uses the Bowmar trademark registered in 1974.Ī sticker on the back of the calculator reads in part: Bowmar MX55 PERSONAL CALCULATOR (/) WITH OMNI-CONSTANT® REGISTER. The plug for the power supply is on the right side. The on/off switch is on the keyboard, the eight-digit display behind this. The handheld calculator has a black plastic case with ten digit keys, a decimal key, keys for the four arithmetic functions, a total key, a percentage key, and a clear/clear entry key.
Some were marketed by other companies, other, like this one, by Bowmar/Ali. In 1970–71, Bowmar decided to design and manufacture portable calculators.
(USA), found they could not sell their displays to Japanese electronic calculator makers. A LED (light–emitting diode) display manufacturer and defense contractor, Bowmar/Ali, Inc. This handheld electronic calculator is one of a series devices introduced by Bowmar in the early 1970s.
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