Most circa 1890s six-pin telegraph lines here in New England like the one you see were upgraded in the 1910s and 1920s with hard-drawn copper wire, new poles and 10-pin crossarms. Most of the insulators of the double petticoat styles were reused; newly added ones were CD 145s, CD 152s and CD 154s. A lot of the new poles were made of cedar and quite a few lasted until when these lines were decommissioned in the 1980s and 1990s.