the lever being a spring, i.e. spring hammers

Full Title

Hammers; Forging machines with hammers or die jaws acting by impact > Special design or construction > with both drive and hammer connected to a fulcrumed lever, e.g. tail hammers > the lever being a spring, i.e. spring hammers

Classification Context

Section:

PERFORMING OPERATIONS; TRANSPORTING

Class:

MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL

Subclass:

FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES