API specification for standard rigs, derricks, and accessory equipment.
Edition: 13th ed.
Published: 1947
Place of publication: Dallas
Language: eng
Number of pages: 39
Subjects: Petroleum industry and trade -- Equipment and supplies.; Pumping machinery -- Specifications.; Petroleum industry and trade -- Standards.
Other titles: Standard rigs, derricks and accessory equipment.
Notes: At head of title: API Std. 4.