Hopper

Details Hopper Hopper

1986-06-12

1989-09-05

Bullock, B. J.

Machines not elsewhere specified

Material working, abrading, or founding machinery

D15199

Patent

active

D03032655

REFERENCES:
patent: Re31934 (1985-07-01), Marston
patent: D186468 (1959-10-01), Wahl
patent: D223510 (1971-04-01), Racca et al.
patent: 2525973 (1950-10-01), Sundstrom et al.
patent: 2686618 (1954-08-01), Mateer
patent: 4418845 (1983-12-01), Hehl
patent: 4690305 (1987-09-01), Copeland

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