Check, Billfold, & Wallet Calculators
The calculators on this page are specifically intended to be carried in the pocket and some can maintain a balance of money.
Their names reflect this by incorporating "Check" (Cheque in the U.K.) or "Billfold" (Wallet in the
U.K.), and for their year of manufacture they are especially slim so that they do not leave a bulge in the pocket.
The calculators featured on this page are:
Check Tronic
Distinctive features: Cheque (check) account calculator. Balance still stored when switched off.
Technical details:
Display is 8 digits, red LED.
4-function.
A standard 4-function calculator incorporated in a wallet for balancing a bank cheque (check) account.
Unusually for this early date, the balance is stored even when the calculator is switched off, and can be recalled when
switched on again. This is achieved by maintaining power to at least the memory.
9v (PP3 battery).
About 1975.
Manufacturing company not known (has logo which may be "AD").
If you have more information about this model please get in touch with us.
Corvus CheckMaster
Distinctive features: Very basic cheque (check) account calculator. Only has "+" and "-" functions. Balance still stored when switched off.
Technical details:
Display is 6 digits, red LED.
2-function.
This is a very basic calculator in a folding case for balancing a bank cheque (check) account. The display has a fixed decimal point for currency calculations, there is no decimal point key, and the only functions that provided
are "Deposit" (add) and "Check" (subtract).
Like the Check Tronic above, the balance is stored even when the calculator is switched off, and can be recalled when next switched on. Again this is achieved by maintaining power to at least the memory.
9v (6x AAA batteries).
In June 1975 JS&A National Sales Group was selling this model at the "introductory price" of US$39.95[1].
Made by Corvus Corporation, of Dallas, Texas.
