The Western Electric adapter was used around WWII. Available in "Large" and "Small" Western Electric Adapters. Used in some test equipment and typically used in applications to ~1GHz.
Max-Gain Systems, Inc. carries a full line of in-series, between series, right angle, T-shaped, quick connect, handie-talkie (BLACK), pigtails (coaxial jumpers), etc... Our RF adapter lines are constantly expanding. We keep our RF connector and adapter lines in stock. We ship both retail and wholesale quantities. To become a dealer / wholesale user, contact us with your potential usage.