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Patents for Williams Robert J. W | |||||
Number | Date | Patentee | Title | Type | |
3,176,449 | Apr. 06, 1965 | C.S. Schultz, W.R. W | Reverse-jet type dust filter | ||
CA-762,268 | Jul. 04, 1967 | W.R. W, C.S. Schultz | Reverse-jet type dust filter |