| 1921 DODD ALVIN Audible Signal Patent Print Art |
| 1948 RHODES Audible Time Signal Patent Print Art |
| 1942 BOLZ Audible Signal Device Patent Print Art |
| 1945 JAMES Audible Stall Indicator Patent Print |
| 1938 GAYNOR Audible Electric Signal Patent Print |
| 1945 CAMERON HAROLD Audible Signal Patent Print |
| 1935 SCHWARZE ELECTRIC Audible Signal Art Print |
| 1936 HARRISON Audible Signal Device Patent Print |
| 1939 EAVES Audible Railroad Signal Patent Print |
| 1956 GEORGE Producing Audible Signals Art Print |
| 1935 VASOLD LEO Audible Signal Patent Print Art |
| 1936 WEISS Audible Mechanical Toy Patent Print |
| 1966 GENE Audible Signal Apparatus Patent Print |
| 1951 AUTH Audible Signaling Device Patent Print |
| 1942 E INGRAHAM Audible Signal Clock Art Print |
| 1936 CARL Audible Electric Signal Patent Print |
| 1936 PIPKIN Audible Signal Device Patent Print |
| 1961 HENRY Audible Fishing Lure Patent Print Art |
| 1942 EMIL AGER Audible Signal Clock Patent Print |
| 1923 DINSMOOR Audible Signal Device Patent Print |
| 1937 PORTER Audible Signal Clock Patent Print |
| 1961 LEONARD Audible Fish Alarms Patent Print |
| 1964 RUSSO Audible Signal Device Patent Print |
| 1963 JOHN TAY Audible Fish Lures Patent Print |