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| All Patents in class 72/481.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 117,838 | Aug. 08, 1871 | R.N. Watrous | Improvement in the construction of dies for forming the lips of auger-bits | drill bits | |
| 179,130 | Jun. 27, 1876 | M.L. Orum | Improvement in pipe-bending mandrels | pipe bending machines | |
| 4,462,243 | Jul. 31, 1984 | R.E. Richards | Tool support for machines | work holding | |