Western Electric Lineman's Telephone Handset, Type 1001, 1903-1910

A lineman's set is used by professional telecommunications workers for the installation and troubleshooting of telephone lines. These devices use a clip with a sharp spike on it, which pierces through wires without the need to strip away the insulating covering. Lineman's sets can hook into exterior phone lines, or the wires leading into the phone jacks in customer's homes.