It is believed this socket is from the mid-1920's. No model number present.
This socket was probably produced ca. 1926.
It is believed this socket is from the late-1920's. Model number 28.
This socket has a 5 date code indicating 1955 production.
This socket was probably produced ca. 1930 or just prior.
This is an early version of the Blackhawk Lock On sockets. The patent pending is believed to refer to the patent for the lock on technology. The patent was filed in August of 1929 and awarded in February of 1934.
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