Assertion: ring's design | /r/ObjectUse | used into 1950
Facets:
Source sentences:
text: Other designs of 13 A fused plugs and socket-outlets, notably the Wylex and Dorman & Smith systems, which did not conform to the chosen standard, were used into the 1950s, but by the 1960s BS 1363 had become the single standard for new installations.