ClipArt ETC
Roller contact timer.

Contact Timer

Roller contact timer.

Atwater-Kent Interrupter.

Interrupter

Atwater-Kent Interrupter.

"A contact twin, since the two individuals lie simply in contact with each other upon a certain plane." — Ford, 1912

Twinned octahedron

"A contact twin, since the two individuals lie simply in contact with each other upon a certain plane."…

A pay phone or pay phone is a public telephone, with payment by inserting money (usually coins) or a credit card or debit card before a call is made.

Pay Phone

A pay phone or pay phone is a public telephone, with payment by inserting money (usually coins) or a…

Shaft carrying switch-contact and gear-shifting.

Shaft

Shaft carrying switch-contact and gear-shifting.

Delco dual type timer with two sets of contacts.

Timer

Delco dual type timer with two sets of contacts.