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3570139
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Information
Patent Grant
3570139
References
Source
Patent Number
3,570,139
Date Filed
Not available
Date Issued
Tuesday, March 16, 1971
53 years ago
CPC
G09B1/00 - Manually or mechanically operated educational appliances using elements forming, or bearing, symbols, signs, pictures, or the like which are arranged or adapted to be arranged in one or more particular ways
A63F2250/021 - with odourized parts
Y10S428/905 - Odor releasing material
US Classifications
434 - Education and demonstration
428 - Stock material or miscellaneous articles
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