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Answer:
PATENTS
Possible Questions:
Inventor's protection
Inventor's safeguards
Inventor's protections
Exclusive rights
Edison's collection
Trademark relatives
Trademark cousins
They might be pending
Their term is usually 20 years
Safeguards of a kind
Protects one's rights, in a way
Protections for inventors
Preventers of many thefts
Monopoly-right documents
Inventors' rights
Inventors' concerns
Inventors' assets
Invention papers
Inventing safeguards
Edison's 1,000+
Edison held hundreds of them