Thingiverse
Tiny Ultrasonic Whistle
von JohnnyShoots
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This is an ultrasonic whistle developed for use in reindeer husbandry as part of fulfilling open source appropriate technology requests.
The [wiki page](http://www.appropedia.org/Open_Source_Ultrasonic_Whistle) covers more depth on the operation of the whistle.
The [wiki page](http://www.appropedia.org/Open_Source_Ultrasonic_Whistle) covers more depth on the operation of the whistle.
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