History on safety valves and safety relief valves
By: National Board of Boiler & Pressure Vessel Inspectors ; by S.F. Harrison.
Contributors: Harrison, S. F.; American Society of Mechanical Engineers
Publisher: The Board
Published: 1978
Place of publication: Columbus, Ohio
Language: eng
Number of pages: 16
Subjects: Steam-boilers -- Safety appliances; Valves
Notes: Cover title.

At head of title: National Board and ASME.