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All Patents in class 33/285 | |||||
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Number | Title | Classification(s) | |||
270,951 | Artificer's Level | 33/285 | |||
313,494 | Surveying Instrument | 33/285 | |||
368,308 | Surveyor's transit | 33/285 | |||
4,752,126 | Surveying Instrument | 33/285, 356/140, 356/147 |