Title:
Mining apparatus
United States Patent 3141521


Inventors:
Read, John A.
Chadbourne, Mark A.
Application Number:
US15628361A
Publication Date:
07/21/1964
Filing Date:
12/01/1961
Assignee:
JOY MFG CO
Primary Class:
Other Classes:
182/36, 182/82, 182/141, 187/270, 187/414
International Classes:
E21D3/00
View Patent Images:
US Patent References:
3016989Elevator plant and its guide rails1962-01-16
2857060Mechanical automobile parking garage1958-10-21
0633215N/A1899-09-19