Entertainment and/or educational device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 8, 1980
Grant Date -
N/A
app pub date -
Sep 16, 1977
filing date -
Sep 16, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
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