Drill shaft head

Details Drill shaft head Drill shaft head

1981-12-09

1984-10-09

Burke, Wallace R.

Machines not elsewhere specified

Material working, abrading, or founding machinery

Element or attachment

D23 42

Patent

active

D02758628

REFERENCES:
patent: 2159162 (1939-05-01), Johnson
patent: 2693631 (1954-11-01), Redman
patent: 3958887 (1976-05-01), Bracey et al.
patent: 3980409 (1976-09-01), Turner
patent: 4088008 (1978-05-01), Watling et al.

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