310 / | HD | ELECTRICAL GENERATOR OR MOTOR STRUCTURE |
300 | DF | NON-DYNAMOELECTRIC {4} |
311 | DF | .~ Piezoelectric elements and devices {17} |
328 | DF | .~.~ With mechanical energy coupling means {6} |
334 | DF | .~.~.~ Acoustic wave type generator or receiver {3} |
336 | .~.~.~.~ Nondestructive testing type |