Related Clues:

• 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
• Clear case first of investigators dropped