In 1947 the NEC required the laundry outlet in dwelling units to be a "3-pole type designed for grounding". 1947: 2124b.
This was expanded in 1956 to "open porches, breezeways, garages, and the like which may supply equipment to be used by persons standing on the ground". 1956: 2124b.
In 1959, type AC was required to have "an internal bonding strip of either copper of aluminum in intimate contact with the armor for its entire length". 1959:334-2(b).
1962 brought about the requirement for branch circuits to "include or provide a grounding conductor to which the grounding contacts of the receptacle or cord connector shall be connected. 1962:210-7.