Rock-drill and rock-drill bit, &c.

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US628530A Rock-drill and rock-drill bit, &c. 失效

Title translation: ROCK-DRILL和ROCK-DRILL BIT，＆C。

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Patent Title: Rock-drill and rock-drill bit, &c.
Patent Title (中): ROCK-DRILL和ROCK-DRILL BIT，＆C。
Application No.: US1898693622

Application Date: 1898-10-15
Publication No.: US628530A

Publication Date: 1899-07-11
Inventor: GOZZARD ALFRED
Applicant: RICHARD NICHOLSON , ROBERT JAMES NICHOLSON
Assignee: Richard Nicholson,Robert James Nicholson
Current Assignee: Richard Nicholson,Robert James Nicholson
Priority: US1898693622 1898-10-15

Rock-drill and rock-drill bit, &c.

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