API specification for rotary drilling equipment.
Publisher: American petroleum institute, Division of production
Published: 1944
Place of publication: Dallas, Tex
Language: eng
Number of pages: 108
Subjects: Boring machinery -- Specifications.; Petroleum industry and trade -- Equipment and supplies.
Other titles: Rotary drilling equipment.
Notes: At head of title: API std. no. 7-B, 9th ed., July, 1944. Supersedes 8th ed., dated May, 1942.
"Revised edition."--p. 3.