[Trade Journal] Publication: Western Electrician Chicago, IL, United States |
||
ILLUSTRATED ELECTRICAL PATENT RECORD. Issued (United States Patent Office) May 10, 1904. · · 759,276. Insulator for Telegraph Wires. Clayton Hobert, Philadelphia, Pa. Application filed April 10, 1903. A lower portion of the insulator screws on to the insulator pin and has upon the top a groove for the reception of the wire. A cap screws on to the lower portion and holds the wire in place. (See cut.)
· · |