from whence electrical-conduit locknuts?

who invented these nuisances (requires a special tool) - and was there an underlying good reason to NOT use ordinary hardware?

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In article

Space - or lack of it in some applications.
They don't require a special tool, though.
--
*Did you ever notice when you blow in a dog's face he gets mad at you? *

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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