Entertainment and/or educational device

Details Entertainment and/or educational device Entertainment and/or educational device

1977-09-16

1980-01-08

Grieb, William H.

35 76, 40518, G09B 124

Patent

active

041820517

ABSTRACT:
An entertainment and/or educational device is proposed which comprises a housing having oppositely facing windows therein and a display element within the housing having related markings thereon, the individual ones of the said related markings being simultaneously visible through a respective one of the windows and the windows being provided in such disposition on the housing that the respective markings visible thereat can be viewed only from opposite sides of the housing.

REFERENCES:
patent: 669682 (1901-03-01), Carver
patent: 1525696 (1925-02-01), Spencer
patent: 1992944 (1935-03-01), Grudin
patent: 2924889 (1960-02-01), Di Lauro
patent: 3392459 (1968-07-01), Schure et al.

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