Assertion: tourmaline's use | /r/HasProperty | covers
Facets:
value: for microwave ovens
type: PURPOSE
Source sentences:
text: Other uses include diaphragms for oxygen-breathing equipment, marker dials for navigation compasses, optical filters, pyrometers, thermal regulators, stove and kerosene heater windows, radiation aperture covers for microwave ovens, and micathermic heater elements.