1933 utility demolition hammer.
"It could cycle 20 times a minute with a drop of 5 to 10 ft., and the operator could increase force with a sharp pull on the hauling line at the top of the cycle."
https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
More:
https://www.oemoffhighway.com/market...eystone-hammer
Previously:
https://www.homemadetools.net/forum/...169#post188036
https://www.homemadetools.net/forum/...646#post182545
https://www.homemadetools.net/forum/...887#post164046
https://www.homemadetools.net/forum/...613#post189836
https://www.homemadetools.net/forum/...178#post115841
