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3646848
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Patent number 3,646,848
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3113741
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Patent number 3,113,741
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Patent number 3,089,370
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B26 - HAND CUTTING TOOLS CUTTING SEVERING
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Patent number 2,838,834
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Patent number 1,645,181
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