Patent August 27, 1918. 35 Ton Capacity. The jack goes up and down. shown in last two photos.
Antique Vintage AO Norton Cast Iron 25 Ton Ratchet Jack, Style 250, Boston, 1918
Vintage Duff Norton Railroad Jack 15 Ton
Vintage Duff Norton Railroad Jack 15 Ton No. 117-AC Working RARE!!
Vintage Duff-Norton Railroad Ratchet Journal Screw Jack