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Patent#2105001, Granted To Walter Michaelis of Germany Assignor to Siemens & Halske Aktiengeskllschaft, for an Alleged New & Useful Improvement in Telephone Systems: Patent Certificate Dated January 11, 1938 Buy on Amazon

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Patent#2105001, Granted To Walter Michaelis of Germany Assignor to Siemens & Halske Aktiengeskllschaft, for an Alleged New & Useful Improvement in Telephone Systems: Patent Certificate Dated January 11, 1938

AuthorUnited States Patent Office
PublisherGovernment Printing Office
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Book Details

Author(s)United States Patent Office
PublisherGovernment Printing Office
ISBN / ASINB0080RBS2E
ISBN-13978B0080RBS28
Sales Rank99,999,999
MarketplaceUnited States  🇺🇸

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