Mechanical safeguards in rotary drilling
By: by H.C. Miller ...
Series: [U.S.] Bureau of mines. Technical paper; 369
Publisher: Govt. Print. Off.
Published: 1925
Place of publication: Washington
Language: eng
Number of pages: 38
Subjects: Oil well drilling.; Machinery -- Safety appliances.; Drilling and boring.
Notes: At head of title: ... Department of Commerce. Herbert Hoover, secretary. Bureau of Mines. D.A. Lyon, acting director.