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Pendulum mounted airbrush
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Patent number 4,928,625
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Issue date May 29, 1990
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Spirotron Corporation
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William A. Woods
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Pendulum design machine
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Patent number 4,703,562
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Issue date Nov 3, 1987
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Dennis H. Burkholder
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Harmonograph
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Patent number 4,199,867
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Issue date Apr 29, 1980
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George Cass
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Pendulum device
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Patent number 4,192,072
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Issue date Mar 11, 1980
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Thomas E. Truitt
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Pendulum drawing machine
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Patent number 4,162,577
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Issue date Jul 31, 1979
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Michael A. Cosman
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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Pendulum toy
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Patent number 3,977,085
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Issue date Aug 31, 1976
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Robert L. Sandifer
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3590488
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Patent number 3,590,488
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Issue date Jul 6, 1971
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3521360
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Patent number 3,521,360
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Issue date Jul 21, 1970
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3496641
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Patent number 3,496,641
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Issue date Feb 24, 1970
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3494037
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Patent number 3,494,037
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Issue date Feb 10, 1970
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3384966
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Patent number 3,384,966
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Issue date May 28, 1968
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3324556
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Patent number 3,324,556
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Issue date Jun 13, 1967
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3246398
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Patent number 3,246,398
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Issue date Apr 19, 1966
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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3143807
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Patent number 3,143,807
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Issue date Aug 11, 1964
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
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1869951
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Patent number 1,869,951
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Issue date Aug 2, 1932
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B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES