Sprockets on shaft rotate against a card to make sound.

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(B)Waves - B+45: Sound Spectrum/Sources

Card pushed against rotating toothed wheels makes sounds. A paper card is pressed against one of the toothed wheels, generating a sound. The frequency of the sound increases with the number of teeth on a wheel, and the motor speed.
UCB Index: 
B+45+35
PIRA Index: 
3C20.40
Demo Diagram: 

UCB Taxonomy:

PIRA Taxonomy:

Video: 

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B+45+32 Twirling Tube
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B+45+40 Caruga horn: Varigated tube to blow through