194 / | HD | CHECK-ACTUATED CONTROL MECHANISMS |
302 | DF | INCLUDING MEANS TO TEST VALIDITY OF CHECK {4} |
303 | DF | .~ By testing material composition {4} |
304 | DF | .~.~ Having electric circuit completed by check {7} |
307 | DF | .~.~.~ Circuit includes movable contact {1} |
308 | DF | .~.~.~.~ Pivotable {1} |
309 | .~.~.~.~.~ Cam actuated |