Not sure about the exact date of this one but I'd judge around 1890-1900. Covered (cloth, cambric or lead) cable was expensive in the turn-of-the century era. Not to mention all of the expense it took in manufacturing individually-combined insulated wires within an overall big piece of cable. Likely that's why open wire was often cheaper until manufacturing techniques for producing individual copper wires and properly insulating them within sheathed cable became more prominent after the earlier 1900's. Most of these "cable" installations were placed underground, very especially in cities and towns after 1900. The predecessor circuits often were very tall open wire lines, with 20-plus ten-pin crossarms on each pole. In the Northeast these structures were short-lived due to ice storms, blizzards, etc. Likely the same elsewhere in North America where the changes of seasons were totally brutal. The general principle of installing paired cables has not changed too much since this photo was taken. Early installations had U-bent "hooks" that supported paired telephone cable from a heavy-duty bare steel supporting cable (messenger) for many years, very especially the lead-covered. With the 50's and later... plastic covered twisted pair telephone cables supporting cable became about....a spun-around stainless steel wrap secured the cable to its supporting messenger. The same principle is still used now. And has been for Cable TV and fiberoptic cables commonly seen nowadays on utility poles. The fiberoptic cables typically have a "straight run" at each pole junction while coaxial (Cable TV) have a U-shaped loop at each pole interface for junction boxes, customer loops, splices, etc.