(Simplified practice recommendation R116-30.) [Title on cover is: Dental brush wheels, elimination of waste through simplified commercial practice. Recommendation became effective Feb. 1, 1931.]
Notes:
(Simplified practice recommendation R116-30.) [Title on cover is: Dental brush wheels, elimination of waste through simplified commercial practice. Recommendation became effective Feb. 1, 1931.] * For Sale by Superintendent of Documents. Paper, 10c.
Availability:
* For Sale by Superintendent of Documents. Paper, 10c.