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Capital Sigma Greek Alphabet Mathematical Summation Math Sign Red Star Pin Badge

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Antique Henkel AG Chemicals Firm German Consumer Goods Company Pin Badge

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Vintage Schrack Austrian Technology Vacuum Tube Circuit Breakers Firm Pin Badge

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Vintage Liebherr Swiss Switzerland Machine Tool Heavy Equipment Pin Badge

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Antique SKL Czech Steel Ball Factory Miniature Actual Working Bearing Pin Badge

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Vintage Faber-Castell Precision Slide Rule 111/54

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Vintage Doduco Electrical Contacts Electronics Company Germany Pin Badge

$20

Hemmi Sun Japan Frederick Post No.1444K With Case Slide Rule Ruler

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Vintage SKF Steel Roller Ball Bearing Swedish Sweden Engineering Firm Pin Badge

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General Electric GE Carboloy Pocket Application Data Booklet 1961

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Vintage Exico British Electric Induction Motors Advertising Logo Pin Badge

$14

Vintage Hammond Roto Finish Michigan Engineering Company Pin Badge