Horology: time measuring systems or devices – Displays or display device details
Patent
1987-11-30
1989-10-03
Roskoski, Bernard
Horology: time measuring systems or devices
Displays or display device details
368242, 368239, G04B 1908
Patent
active
048721506
ABSTRACT:
Apparatus is disclosed for assistance in learning binary number notation. Various examples of the apparatus are disclosed, each example comprising symbols each of which can be switched between two states in which it is respectively visible and invisible. Further, each symbol is oriented differently to the other symbols or alternatively the apparatus is provided with other insignia which enables each symbol to be distinguished from the others without reference to the others. Similar apparatus with symbols other than visible symbols is suggested.
REFERENCES:
patent: 3677549 (1972-07-01), Moscovich
patent: 3744235 (1973-07-01), Kratomi
patent: 3750384 (1973-08-01), Miller et al.
patent: 3919835 (1975-11-01), Kashio
patent: 3943288 (1976-03-01), Reed et al.
patent: 3992875 (1976-11-01), Kashio
patent: 4618265 (1986-10-01), Wadowski
"Binary Clock", Osburne Wireless World, vol. 6, (1980), No. 1535, Sussex, pp. 65, 66, Aug. 1980.
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