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2-Prong Plug in the US & Mfg. Date
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<p>[QUOTE="Joe in PA, post: 9629330, member: 12740"]Polarized outlets came into usage around 1962. Devices took longer to adapt, so if it has an original polarized plug is at least 1962. Unpolarized were still used for quite a while after that. The radios/TV's etc with a "hot chassis" started to use them first if I recall correctly.[/QUOTE]</p><p><br /></p>
[QUOTE="Joe in PA, post: 9629330, member: 12740"]Polarized outlets came into usage around 1962. Devices took longer to adapt, so if it has an original polarized plug is at least 1962. Unpolarized were still used for quite a while after that. The radios/TV's etc with a "hot chassis" started to use them first if I recall correctly.[/QUOTE]
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