[Trade Journal] Publication: Western Electrician Chicago, IL, United States |
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ILLUSTRATED ELECTRICAL PATENT RECORD. Issued (United States Patent Office) May 12, 1908. · · 887,336. Electric Insulator. Herman Mieth, Vallejo, Cal. Application filed May 29, 1906. Upper and lower holding rods are joined by a petticoated insulating connection. About this are two separate casings open at one end. The inner one extends upward and the outer one downward. (See cut on next page.) · ·
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