| 194 / | HD | CHECK-ACTUATED CONTROL MECHANISMS |
| 302 | DF | INCLUDING MEANS TO TEST VALIDITY OF CHECK {4} |
| 303 | DF | .~ By testing material composition {4} |
| 320 | DF | .~.~ Having magnetic field acting on check {3} |
| 325 | DF | .~.~.~ Speed or path of check altered {1} |
| 326 | ![]() | .~.~.~.~ After impact with rigid body (i.e., bounce test) |