Contrinex: Produces a wide range of proximity switches, including virtually all the common standardized inductive and photoelectric types with a specialty in high-performance devices.

Mencom Corporation: Molded cables, receptacles, Multi-pin industrial rectangular connectors for power and data lines, A wide variety of metric, PG and NPT cable glands, and Panel Interface Connectors. 

Catalog (pdf file), Online Catalog

ILME: Heavy duty multipole connectors. (Supported by Mencom)

Overview Catalog Pages 1-4