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3620552
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Information
Patent Grant
3620552
References
Source
Patent Number
3,620,552
Date Filed
Not available
Date Issued
Tuesday, November 16, 1971
52 years ago
CPC
G09B29/00 - Maps Plans Charts Diagrams
B42D1/001 - with at least two separate sets of sheets
B42D1/06 - in which the fillings and covers are united by other means
B42D3/12 - combined with other articles
B42D3/126 - enabling the book to be positioned upright
B42D5/008 - with means for engaging sheet perforations or slots
G09B3/00 - Manually or mechanically operated teaching appliances working with questions and answers
US Classifications
281 - Books, strips, and leaves
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