| Patents for Henry C. Pierle |
Patents 1 -
12
of 12
      |
| Number | Date | Patentee | Title | Type |
| 998,088 | Jul. 18, 1911 | W.F. Groene, H.C. Pierle | Hob-grinding attachment | cutter grinding machines |
| 1,248,317 | Nov. 27, 1917 | W.F. Groene, H.C. Pierle | Machine-tool | metalworking machines |
| 1,374,109 | Apr. 05, 1921 | H.C. Pierle | Change-of-speed mechanism | drill presses |
| 1,617,606 | Feb. 15, 1927 | H.C. Pierle | Machine Tool | metalworking machines |
| 2,042,123 | May 26, 1936 | H.C. Pierle | Loading and Unloadng of Work in Machine Tools | metalworking machine mechanisms |
| 2,080,228 | May 11, 1937 | H.C. Pierle | Work Rotating Structure foe Machine Tools | metalworking machine mechanisms |
| 2,089,421 | Aug. 10, 1937 | H.C. Pierle | Tool Holder for Lathes | metalworking machine mechanisms |
| 2,103,298 | Dec. 28, 1937 | H.C. Pierle | Multiple spindle center drive crankshaft lathe | crankshaft lathes |
| 2,173,633 | Sep. 19, 1939 | H.C. Pierle | Tool Holder for Lathes | lathe tool holders and tool posts |
| 2,198,090 | Apr. 23, 1940 | W.F. Groene, H.C. Pierle | Taper Attachment for Lathes | metal lathe accessories and attachments |
| 2,320,333 | May 25, 1943 | H.C. Pierle | Gun boring tool | gunsmith |
| 2,392,186 | Jan. 01, 1946 | H.C. Pierle | Work Handling Mechanism | metalworking machine mechanisms |
