Assertion: bobbin's thread | /r/HasProperty | linen
Facets:
value: before 1800
type: TEMPORAL
value: usually
type: DEGREE
Source sentences:
text: Threads can be cotton, linen, silk, some metallic, and even knitting and crochet yarn.
text: Before 1800 the threads of lace were usually linen; after 1800 cotton was more common.