(Commercial standard CS6-31.) [Title on cover is: Wrought-iron pipe nipples, recorded standard of the industry. Effective date for new production and clearance of existing stocks, May 1, 1931.]
Notes:
(Commercial standard CS6-31.) [Title on cover is: Wrought-iron pipe nipples, recorded standard of the industry. Effective date for new production and clearance of existing stocks, May 1, 1931.] * For Sale by Superintendent of Documents. Paper, 5c.
Availability:
* For Sale by Superintendent of Documents. Paper, 5c.