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| All Patents in class 91/399 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,132,649 | Mar. 23, 1915 | B. Brazelle | Pneumatic tool | pneumatic tools | |
| 1,429,421 | Sep. 19, 1922 | E.J. Fritsch, R.W. Nazel | Fluid-power hammer | drop hammers | |