Assertion: laser | /r/HasProperty | class 4
Facets:
value: under the old class system
type: OTHER
value: as a guideline
type: MANNER
Source sentences:
text: As a guideline, under the old class system, lasers were considered class 4 when their optical power was over 500 mW. There are in fact many applications that use class 4 lasers; laser engraving, 3D printing, and material cutting, just to name a few.