In article , "Morris Dovey" wrote:
Similar to mortise and tenon - except that I think of a mortise as a
(doubly) stopped dado, and this isn't stopped at either end.

Do A and B have different names, or do they share the same name?

A is a dado, B is a locking rabbet.

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Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.