Assertion: lens | /r/CreatedBy | grinding solid pieces of glass
Facets:
value: into different shapes
type: OTHER
value: virtually
type: MANNER
Source sentences:
text: Until plastics became common in the 20th century, virtually all lenses were made by grinding solid pieces of glass into different shapes.
text: Until plastics became common in the 20th century, virtually all lenses were made by grinding solid pieces of glass into different shapes.