Boots – shoes – and leggings
Patent
1977-01-31
1978-05-30
Smith, Jerry
Boots, shoes, and leggings
35 5, 35 31C, 340365R, 364708, G06F 738, G06F 1502
Patent
active
040925277
ABSTRACT:
A calculator, which may be used for educational purposes, for instance, is preferably provided with an integrated circuit, a display for displaying a number outputted by the integrated circuit, an array of key switches for inputting numeric and functional data to the integrated circuit, a keyset comprising an array of key switch push buttons moveably disposed in openings in a member retaining the array and a case in which the integrated circuit, display and the array of key switches are disposed. The case also is provided with an opening for removeably receiving the keyset, the keyset being disposed adjacent to the array of key switches when received in the opening. The calculator is preferably provided with a plurality of such keysets, the keysets each having different configurations of key push buttons for permitting an operator of the calculator to be able to access either to selected key switches or all key switches depending upon the particular keyset used. Further, the keyset preferably temporarily locks into place when operationally disposed against the array of key switches and the operation of a given push button causes actuation of the adjacent key switch.
REFERENCES:
patent: 3253352 (1966-05-01), Kobler et al.
patent: 3560964 (1971-02-01), Bedell et al.
patent: 3971925 (1976-07-01), Wenninger et al.
patent: 3978328 (1976-08-01), Fabry et al.
D. P. Karp et al., "Functionally Alterable . . . Replaceable Keys" IBM Tech. Disc. Bulletin, vol. 17, No. 1, Jun. 1974, pp. 309-311.
Berg Richard P.
Comfort James T.
Grossman Rene E.
Smith Jerry
Texas Instruments Incorporated
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