"RST Engineering" wrote:
What is a relay switch? I've never seen one. I've seen
relays. I've seen switches. I've never seen a relay switch.


A quick Google shows the R40-etc. is a discontinued relay. It
would seem like a Rube Goldberg setup for a simple audio switching
panel. Unless it fancily switches comm 1/2 with simple pushbuttons
and indicator lights. Thence a latching relay, or more Rube
Goldbergian, with a monostable and a flip-flop? But if it has a
BOTH feature, then how we do that? :-)

Reg,
Fred F.