1. Allows for the smooth tracking of a tripod or stand for a camera, microphone, etc. Can be set up in a wheel only situation, or with a track which the wheels rest on for predefined movement.
2. Specifically, caster assembly for a grand piano.
http://www.pianoaccessories.ca/en/our-products/Piano-Dollies-and-Trucks/Jansen-Grand-Piano-Truck-Dolly.html
2. Specifically, caster assembly for a grand piano.
http://www.pianoaccessories.ca/en/our-products/Piano-Dollies-and-Trucks/Jansen-Grand-Piano-Truck-Dolly.html
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