Portable oil well walking beam pump jack

Machines not elsewhere specified – Pump or compressor

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D02764342

REFERENCES:
patent: 3055228 (1962-09-01), McStravick
patent: 3136166 (1964-06-01), Journeay
patent: 4050858 (1977-09-01), Ewbank et al.
patent: 4070135 (1978-01-01), Eller

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