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Telephone cord rotary connector
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Patent number D338654
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Issue date Aug 24, 1993
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Telephone Products, Inc.
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Albert Ditzig
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D13 - Equipment for production, distribution, or transformation of energy
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Desktop decision maker novelty
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Patent number D325594
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Issue date Apr 21, 1992
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Telephone Products, Inc.
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Albert Ditzig
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D11 - Jewelry, symbolic insignia, and ornaments
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Rotary electrical connector
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Patent number D321503
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Issue date Nov 12, 1991
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Telephone Products, Inc.
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Albert Ditzig
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D13 - Equipment for production, distribution, or transformation of energy