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Author Topic: PM research whistle + S-50!  (Read 1749 times)

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Re: PM research whistle + S-50!
« on: March 20, 2024, 08:12:54 pm »
Here it is, a bit louder, from modifications, and an added pull cord.


The steam engine has done much more for science than science has done for the steam engine.”

― Lord Kelvin