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

Book Details
ISBN / ASIN B0080RBS2E
ISBN-13 978B0080RBS28
Sales Rank #99,999,999
Marketplace United States 🇺🇸
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