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| All Patents in class 33/532 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,411,911 | Apr. 04, 1922 | A. Desbains | Taper Gauge | measurement gauges | |
| 1,427,510 | Aug. 29, 1922 | W. Avery | Taper Attachment for Lathes | metal lathe accessories and attachments | |
| 1,491,613 | Apr. 22, 1924 | G.L. Miller | Apparatus for Gauging Taper Pieces | special purpose gauges | |
| 2,746,158 | May 22, 1956 | G.L. Gershman | Taper micrometer | micrometers | |
| 3,327,399 | Jun. 27, 1967 | G.L. Gershman | Datum line taper micrometer | micrometers | |