Support for a power mask for drilling wells

Machines not elsewhere specified – Agricultural or construction machinery – Drilling – mining – or soil treatment

Patent

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Details

D15138, D15141

Patent

active

D02797852

REFERENCES:
patent: 1652650 (1927-12-01), Watson et al.
patent: 2075185 (1937-03-01), Eiler
patent: 2203113 (1940-06-01), Wecker et al.
patent: 2474981 (1949-07-01), McCardell
patent: 3084808 (1963-04-01), Peduzzi et al.

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