Monteverdi E240 Handheld Electronic Calculator Sold by Lloyd's Electronics

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This handheld electronic calculator has a tan plastic case and twenty-five square plastic keys. In addition to ten digit keys, a decimal point key, and a total key, it has a clear/clear entry key, a change sign key, a square root key, an exchange key, a percentage key, four arithmetic function keys, and four memory keys. The power switch is above this. Text behind the keyboard reads: Monteverdi. Behind this is the eight-digit vacuum fluorescent display. A power jack is on the back edge.
A compartment at the base of the back would hold four batteries. A sticker above this reads in part: Monteverdi 6V D.C. 300mW (/) MODEL E420 SERIES 255A. It then gives several examples for operating the calculator. Text below this reads: SERIAL NO. 6B-101471 (/) MADE IN JAPAN.
For further information about Lloyd’s Electronics, Inc., see 1986.0988.218.
The name of Lloyd’s Electronics does not appear on this calculator. However, the company filed for two trademarks for the term Monteverdi, used for other electronic equipment, in 1975 and 1976. These were registered in 1977. The calculator also is very similar in style to Lloyd’s model E419 (1986.0988.217).
Currently not on view
date made
ca 1976
Lloyd's Electronics
Physical Description
plastic (case; keys; display cover material)
metal (circuitry material)
paper (sticker material)
overall: 1 in x 3 1/2 in x 5 1/2 in; 2.54 cm x 8.89 cm x 13.97 cm
ID Number
catalog number
accession number
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History


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