Assertion: mechanical television | /r/AtLocation | united states
Facets:
value: from 1928
type: TEMPORAL
value: commercially
type: MANNER
Source sentences:
text: Mechanical televisions were commercially sold from 1928 to 1934 in the United Kingdom, United States, and Soviet Union.
text: Mechanical televisions were commercially sold from 1928 to 1934 in the United Kingdom, United States, and Soviet Union.
text: Mechanical televisions were commercially sold from 1928 to 1934 in the United Kingdom, United States, and Soviet Union.