An antique Machen & Mayer push-button 3-way switch with an aged ceramic housing and brass cover plate, original examination paper. 1907, Tag (Examined and Approved by the Underwriter's National Electric Association for use under the rules and requirements the national, Board of Fire Underwriters.), Stamp (Machen & Mayer Elct.mfg.co.Phila pa)
An antique Machen & Mayer push-button 3-way switch with an aged ceramic housing and brass cover plate, original examination paper. 1907, Tag (Examined and Approved by the Underwriter's National Electric Association for use under the rules and requirements the national, Board of Fire Underwriters.), Stamp (Machen & Mayer Elct.mfg.co.Phila pa)
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