The Siemon Company
The Siemon Company is a manufacturer and designer of network cabling and coupling devices based in Watertown, Connecticut. It was founded in 1903 by Carl F. Siemon as The Siemon Hard Rubber Company. It is a privately held company.
In 1906 they entered the new telecommunications industry. AT&T's three-pole connecting blocks were ceramic and thus easy to break. Carl Siemon manufactured a durable plastic version identical to the AT&T block and became a supplier for AT&T and the later "Baby Bells."
Already a long-time supplier to Western Electric (AT&T), in the 1960s Siemon began shipping its "66" connecting blocks to other customers, serving the increasing demand for new and better telecommunications. The 1960s and '70s were rising times for telecommunication expansion. The "66" block quickly became the standard for installing new telephone systems.
Currently, Siemon is one of the world's largest networking and cabling manufacturers, making Category 5e, 6, and 7 cabling systems.