(Commercial standard CS27-30.) [Title on cover is: Plate glass mirrors, elimination of waste through simplified commercial practice. Effective date for new production, Dec. 15, 1930.]
Notes:
(Commercial standard CS27-30.) [Title on cover is: Plate glass mirrors, elimination of waste through simplified commercial practice. Effective date for new production, Dec. 15, 1930.] * For Sale by Superintendent of Documents. Paper, 5c.
Availability:
* For Sale by Superintendent of Documents. Paper, 5c.