[Trade Journal] Publication: Western Electrician Chicago, IL, United States |
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ILLUSTRATED ELECTRICAL PATENT RECORD. Issued (United States Patent Office) October 15, 1907. · ·
868,122. Electric Insulator. Francis J. Poinan, Rochester, N. Y. Application filed July 30, 1906. This insulator is made in several parts. The lower part is of glass and has a sleeve and head fitting over the pin, and flaring conical petticoat. The top of the insulator is of different material and is made in three parts cemented together. (See cut.) · · |