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 | .~.~.~ Speed or path of check altered {1} | |
326 | DF | .~.~.~.~> After impact with rigid body (i.e., bounce test) |