| 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 | | .~.~.~.~ Pivotable {1} |
| 309 | DF | .~.~.~.~.~> Cam actuated |