Assertion: copper sulfate's employment | /r/AtLocation | agriculture
Facets:
value: up to a generation
type: TEMPORAL
Source sentences:
text: Its principal employment is in agriculture, and, up to a generation or so ago, about its only uses in industry were as a mordant for dyeing and for electroplating.
text: Its principal employment is in agriculture, and this role is described in some detail in the next section.
text: Its principal employment is in agriculture, and, up to a generation or so ago, about its only uses in industry were as a mordant for dyeing and for electroplating.