Related Clues:
- One of Edison's 1,093
- Protection for an idea
- Any of Edison's 1,000
- Clear case, unpacking middle
- Inventor's acquisition
- Before you and me boo Vi discontentedly and without subtlety
- Old boy with debts accepting five will be clear
- Not seeing line I erased — that’s clear
- Not subtle, but clear
- Inventor's concern
- George Washington signed America's first one in 1790
- Evident father needs temporary accommodation
- Old boy and girl taking over American patent
- Plain case has lost ivory top
- Government department responsible for preventing invention fraud