29 / | HD | METAL WORKING |
592 | DF | METHOD OF MECHANICAL MANUFACTURE {54} |
428 | DF | .~ Assembling or joining {21} |
464 | DF | .~.~ Associating parts by use of aligning means (e.g., use of a drift pin or a "fixture") {4} |
465 | .~.~.~ Registering mating opposed tool parts (e.g., registering a punch and a cooperating die) |