| Time's 2007 "Invention of the Year |
| Aeronautical inclination |
| Poet who's the subject of Tom Stoppard's "The Invention of Love |
| Ohio's "City of Invention |
| Country carved up in 1920 |
| Aeronautical pioneer |
| Invention, informally |
| Finnish pentathlete Lehtonen who won back-to-back Olympic gold medals in the 1920s |
| Does a belly flop, aeronautically |
| Aeronautical worry |
| Art ___ (1920s-'30s architectural style) |
| Offspring of Samuel Colt's invention. |
| 1920's swimming sensation Gertrude |
| Adverb re a John Napier invention |
| Accomplice of Leopold in the 1920s |
| Guitarist Frank of the Mothers of Invention |
| American voters before 1920 |
| Invention necessity |
| “A ludicrous invention,” per Germaine Greer |
| Bette Nesmith Graham's invention, 1957 |
| Groundbreaking invention? |
| Bohemian socialites in 1920s' London |
| Albert Hofmann's invention |
| Reward for a Ringling invention? |
| Invention that prompted NBC to adopt the peacock logo |
| A 1793 invention |
| 1920's-30's lawman |
| Arthur Wynne invention: Dec. 21, 1913 |
| Daimler invention |
| Wynne's invention: 1913 |