Title:
Mining and excavating machine of the rotary type
United States Patent 2919121
Inventors:
Ruth, Joseph P.
Publication Date:
12/29/1959
Export Citation:
Click for automatic bibliography generation
Assignee:
Ruth, Joseph P.
Primary Class:
299/31
Other Classes:
175/62, 175/76, 175/94, 175/95, 175/99, 175/102, 175/319, 175/388, 299/62, 299/87.1, 405/138
International Classes:
E21C35/08; E21D9/11; E21C35/00; E21D9/10
View Patent Images:
Download PDF 2919121        PDF help
US Patent References:
2821374Coal mining machine having a pivotally mounted cutter tube
2798707Rotary type tunneling machine
2756037Mining machines having oppositely rotating boring heads
2211223Excavator and pipe layer
1073184N/A
0537899N/A
Foreign References:
AU165358B