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Mathematics teaching aid
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Patent number 9,569,981
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Issue date Feb 14, 2017
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David Duncan Cheek
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A63 - SPORTS GAMES AMUSEMENTS
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Chore buddy
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Patent number 6,837,714
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Issue date Jan 4, 2005
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Jean Ione Womack
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Teaching puzzle
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Patent number 6,702,586
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Issue date Mar 9, 2004
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Sharmac Designs LLC
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Sharon A. Miller
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A63 - SPORTS GAMES AMUSEMENTS
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Education system
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Patent number 5,626,477
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Issue date May 6, 1997
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Joan F. Adkison
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Vocabulary board game
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Patent number 5,316,482
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Issue date May 31, 1994
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Kirk R. Bryson
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Business education model
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Patent number 5,056,792
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Issue date Oct 15, 1991
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Brian Helweg-Larsen
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Educational card game system
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Patent number 4,957,443
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Issue date Sep 18, 1990
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Franklin B. Schwartz
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Arithmetic device
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Patent number 3,999,310
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Issue date Dec 28, 1976
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James Alan Lufkin
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3760511
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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2890527
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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1055151
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Issue date Mar 4, 1913
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS