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All Patents in class 33/420 | |||||
Number | Date | Patentee | Title | Type | |
1,438,432 | Dec. 12, 1922 | J.W. Evans | Framing Square with Pitch Attachment | squares | |
1,730,852 | Oct. 08, 1929 | W. Jenny | Angle and Hypotenuse Measuring Instrument | protractors |