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[QUOTE]Originally posted by Rick A: [QB] Patents for steam whistles. https://patents.google.com/patent/US14562A/en?q=steam&q=whistle&q=patents&oq=+steam+whistle+++patents&page=3 https://patents.google.com/patent/US4541A/en?q=steam&q=whistle&q=patents&oq=+steam+whistle+++patents&page=5 https://patents.google.com/patent/USRE621E/en?q=steam&q=whistle&q=patents&oq=+steam+whistle+++patents&page=6 And more: https://patents.google.com/?q=steam&q=whistle&q=patents&oq=+steam+whistle+++patents [/QB][/QUOTE]
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