(Simplified practice recommendation no. 73.) [Title on cover is: Elimination of waste, simplified practice, one-piece porcelain insulators. Recommendation became effective Oct. 1, 1927.]
Notes:
(Simplified practice recommendation no. 73.) [Title on cover is: Elimination of waste, simplified practice, one-piece porcelain insulators. Recommendation became effective Oct. 1, 1927.] * For Sale by Superintendent of Documents. Paper, 5c.
Availability:
* For Sale by Superintendent of Documents. Paper, 5c.