Re: Another unusual plug and some other questions
Surely if something becomes compulsory in law then any patent covering it would be annulled? Otherwise, one firm would have an unfair legal advantage, which would be tantamount to privatisation of the law.
Although, a 1967 patent would have run out by 1987 -- so maybe they just waited for it to expire and allow anybody to make sleeved plugs, before changing the regulations.
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