Assertion: lamp's bulb | /r/HasProperty | demonstrated at the world
Facets:
value: in paris
type: LOCATION
Source sentences:
text: Later he lived in the US, changed his name to Alexander de Lodyguine and applied and obtained patents for incandescent lamps having chromium, iridium, rhodium, ruthenium, osmium, molybdenum and tungsten filaments, and a bulb using a molybdenum filament was demonstrated at the world fair of 1900 in Paris.