Baltimore Glass Manufacturing Co.

Picture courtesy Bob Berry

Hemingray-20 // Made in USA

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Pat Dec 19 1871 / Patent May 2 1893

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Dot / Dot (King City Glass Works)

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Electrical Supply Co. / Chicago

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Westinghouse

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Western Glass Manufacturing Co.

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"P in a Diamond" (Pennycuick Patent)

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(crown) W. Brookfield

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(crown) W. Brookfield (CD 162 w/no inner skirt)

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Thomson-Houston Electrical Co.

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(base) American Insulator Co.

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W.F.G.CO. (Western Flint Glass Co.)

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Pat Dec 19 1871 / Patent May 2 1893

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Patent / Dec. 19, 1871 (Hemingray)

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Pettingell Andrews Co. Boston

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No markings (Pennycuick)

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