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Class 252 Compositions... Patent Classification Definitions... Patent And Trademark Office... U.S. Dept. Of Commerce... June 1997
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Class 252 Compositions... Patent Classification Definitions... Patent And Trademark Office... U.S. Dept. Of Commerce... December 1996
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Class 252 Compositions Patent Classification Definitions U.S. Dept. Of Commerce December 1998
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Class 100 Presses... Patent Classification Definitions... Patent And Trademark Office... U.S. Dept. Of Commerce... June 1997
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Class 248 Support... Patent Classification Definitions... Patent And Trademark Office... U.S. Dept. Of Commerce... June 1997
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Class 244 Aeronautics... Patent Classification Definitions... Patent And Trademark Office... U.S. Dept. Of Commerce... June 1997
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Class 235 Registers... Patent Classification Definitions... Patent And Trademark Office... U.S. Dept. Of Commerce... June 1997
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Class 269 Work Holders... Patent Classification Definitions... Patent And Trademark Office... U.S. Dept. Of Commerce... June 1997
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Class 283 Printed Matter... Patent Classification Definitions... Patent And Trademark Office... U.S. Dept. Of Commerce... June 1997
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Class 81 Tools... Patent Classification Definitions... Patent And Trademark Office... U.S. Dept. Of Commerce... June 1997
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