Assertion: trichloroethylene | /r/AtLocation | a two-step process
Facets:
value: from acetylene
type: OTHER
value: prior to the early 1970s
type: TEMPORAL
Source sentences:
text: Prior to the early 1970s, most trichloroethylene was produced in a two-step process from acetylene.
text: Prior to the early 1970s, most trichloroethylene was produced in a two-step process from acetylene.