[ggchappell]

> is the lock the first machine to do a discrete, conditional action?

Interesting question.

I would guess that the answer is "no". Animal traps based on some kind of triggered action probably predated the keyed lock.

[abecedarius]

Good point! I feel embarrassed. Thanks.

(Maybe the lock could still get credit for the logical AND?)

[JacobAldridge]

Never feel embarrassed for asking a great question!

[ggchappell]

Agreed.