Re: Another unusual plug and some other questions
Plugs with part-insulated pins were available before the war, so the 1967 patent would have been to some particular detail of construction.
As regards standards, the last time I looked, the British Standards Institute stated in their literature that they would only consider incorporating something that is covered by a patent into a British Standard if the patent was irrevocably endorsed "Licence of Right", which means that the patent's owner would be obliged to grant a licence to any one who wants one on reasonable terms.
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