Fluid filtration unit for use in oil well hole drilling operatio

Machines not elsewhere specified – Pump or compressor

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D02922150

REFERENCES:
patent: D183115 (1958-07-01), Calloway
patent: D279377 (1985-06-01), Kuchar
patent: D282547 (1986-02-01), McCombs
patent: 3397784 (1968-08-01), Carr
patent: 3618781 (1971-11-01), Brown
patent: 3757956 (1973-09-01), Bradel et al.
patent: 4033870 (1977-07-01), Parquet et al.
patent: 4049548 (1977-09-01), Dickerson
patent: 4059123 (1977-11-01), Bartas et al.

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