Assertion: lamp's bulb | /r/CreatedBy | a team of three workers
Facets:
value: until 1910
type: TEMPORAL
value: generally
type: MANNER
Source sentences:
text: Until 1910, when Libbey's Westlake machine went into production, bulbs were generally produced by a team of three workers (two gatherers and a master gaffer) blowing the bulbs into wooden or cast-iron molds, coated with a paste.