Question: Who invented the first efficient incandescent light bulb that was later used in projectors?
qaPairs: question: Who invented the first efficient incandescent light bulb that was used in projectors?
answer: Koninklijke Philips N.V.
Philips
question: Who invented the first efficient incandescent light bulb that was later improved and eventually used in projectors?
answer: Thomas Alva Edison
Edison
Thomas Edison