INTERSWITCH (Purdy Electronics) has been supplying original equipment manufacturers with a specialty line of switches and keypads for over 40 years. Specific products that INTERSWITCH offers include the following: Thumbwheel Switches; Rotary DIP Code Switches; Codicount 7 Segment Displays Switches; and Keypads for harsh environments. All (AND Displays, Interfan, AND Optoelectronics, Interswitch, or Interoptics) products are covered by a one-year warranty against defects in materials or workmanship.
Thumbwheel and codicount switches are generally found on the front panels of various instruments and equipment, while DIP switches are usually found tucked away on circuit boards inside the system
INTERSWITCH Website