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| All Patents in class 33/228 | |||||
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| Number | Date | Patentee | Title | Type | |
| 292,415 | Jan. 22, 1884 | S. Darling | Comparator | comparators | |
| 4,598,481 | Jul. 08, 1986 | R.L. Donahue | Intersecting laser alignment apparatus and method | vehicle body and frame repairer | |