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| All Patents in class 451/388 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,263,057 | Apr. 16, 1918 | J.T. Griffin | Mica Grinding Machine | ||
 | 2,372,812 | Apr. 03, 1945 | H.E. Crozier | Vacuum polishing lathe | |
| 3,293,739 | Dec. 27, 1966 | C.W. Hoglund, A.G. Coy | Method of holding deformable objects | ||
 | 4,705,438 | Nov. 10, 1987 | S.S. Zimmerman, L.W. Syarto | Machining center having an inclinable vacuum-holding worktable | |
 | 4,719,721 | Jan. 19, 1988 | L.E. Stump | Conveyor bed assembly and vacuum platen | |