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Thank you! I'm glad you like them! It's an honor to be recognized by another whistle maker on Thingiverse!

Yeah, there are only a handful of dual side edge-tone whistle designers! We've got you, wbohelps, zachary91, mistertech, and myself (if we exclude the beat and all the train whistles). Please rest assured I didn't copy yours or anyone's design (I assume you're insinuating by making the comparison); I designed these from scratch. Please print a D2, compare with your whistle, and I'm sure you'll agree they're very different!

Thank you again for taking the time to let me know you think they're nice! It means a lot! :D

Dual Tube Security Whistle
by Qrome
Dual tube whistle
2 chamber whistle (LOUD)
2 Tone Key Chain Safety Whistle
Emergency & Sports Whistle