Assertion: disc's groove | /r/HasProperty | shaped in cross-section
Facets:
Source sentences:
text: The Brunswick Ultona, the Sonora, and the expensive "Duo-Vox" phonograph made by the piano manufacturer Bush and Lane were the only non-Edison machines that came from the factory equipped to play Diamond Discs as well as Victor and other 'needle-type' records, along with Pathé's sapphire ball stylus hill-and-dale format that used a vertical groove that was U-shaped in cross-section.