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Insulator Manufacturing Patents
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Brookfield Mold Process Patent #103555
Brookfield Mold Process Patent #113393
Hemingray Mold Process Patent #122015
Deemer & Eufinger Glass Press Patent #131153
Oakman Segmented Thread Process Patent #132214
Oakman Segmented Thread Process Patent #132215
Hemingray Glass Press Patent #242825
Oakman Thread Process Patent #247100
Johnson Glass Press Patent #282989
Murphy Glass Press Patent #291072
Krell Glass Press Patent #303936
Oakman Mold Process Patent #304748
Gray Glass Press Patent #306146
Gray & Ham Glass Press Patent #306147
Weyman Glass Press Patent #310484
Pennycuick Thread Process Patent #324157
Brookfield Glass Press Patent #646948