Related Clues:

• Any of Edison's 1,000
• Clear case, unpacking middle
• Inventor's acquisition
• Inventor's concern
• George Washington signed America's first one in 1790
• Evident father needs temporary accommodation
• Plain case has lost ivory top
• Government department responsible for preventing invention fraud
• Tolerating delay saying goodbye to island, that’s clear
• One of 1,093 for Thomas Edison
• Clear evidence of invention
• Lying open, one undergoing treatment has heart removed
• Inventor’s document
• Clear butter quantity probed by all fingers and thumbs, say?
• Easily recognizable