470 / | HD | THREADED, HEADED FASTENER, OR WASHER MAKING: PROCESS AND APPARATUS |
1 | DF | PROCESS {5} |
27 | DF | .~ Making headed fastener, e.g., rivet or nail, etc. {2} |
28 | .~.~ Rivet type {3} | |
29 | DF | .~.~.~> Hollow type {1} |
31 | DF | .~.~.~> Formed by extrusion |
32 | DF | .~.~.~> Formed by heat treatment {1} |