| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| Joseph Bramah invented several machine tools to make his "pickproof" type of this device | a lock | $300 | J | INVENTORS | 1993-12-16 | #2139 | |
| Inspired by wooden versions made in Ancient Egypt, Cyrus Yale made 1st cylinder type of this in 1848 | a lock | $200 | DJ | INVENTIONS | 1987-07-06 | #671 |