(Commercial standard CS 17-30.) [Title on cover is: Diamond core drill fittings, elimination of waste through simplified commercial practice. Effective date for new production, Jan. 1, 1930, for clearance of existing stock, July 1, 1930.]
Notes:
(Commercial standard CS 17-30.) [Title on cover is: Diamond core drill fittings, elimination of waste through simplified commercial practice. Effective date for new production, Jan. 1, 1930, for clearance of existing stock, July 1, 1930.] * For Sale by Superintendent of Documents. Paper, 10c.
Availability:
* For Sale by Superintendent of Documents. Paper, 10c.