Invention Grant
- Patent Title: Rock-drill.
- Patent Title (中): ROCK-DRILL。
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Application No.: US13904716Application Date: 1916-12-26
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Publication No.: US1214665APublication Date: 1917-02-06
- Inventor: FERGUSON SEYMOUR
- Applicant: FERGUSON SEYMOUR
- Assignee: Seymour Ferguson
- Current Assignee: Seymour Ferguson
- Priority: US13904716 1916-12-26
- Main IPC: E21B1/30
- IPC: E21B1/30
Public/Granted literature
- US20140356768A1 CHARGED BEAM PLASMA APPARATUS FOR PHOTOMASK MANUFACTURE APPLICATIONS Public/Granted day:2014-12-04
Information query
