| 1920 WILILAM Sound Regulator Audible Signals Art |
| 1921 DODD ALVIN Audible Signal Patent Print Art |
| 1948 RHODES Audible Time Signal Patent Print Art |
| 1942 BOLZ Audible Signal Device Patent Print Art |
| 1944 STANDARD Electromagnetic Audible Signal Art |
| 1944 KENERSON Electromagnetic Audible Signal Art |
| 1964 WHEELOCK SIGNALS INC Audible Signal Art |
| 1951 EDWARDS INC Audible Electric Signaling Art |
| 1935 SCHWARZE ELECTRIC Audible Signal Art Print |
| 1956 GEORGE Producing Audible Signals Art Print |
| 1966 WALLACE TIERNAN INC Audible Signal Art |
| 1935 VASOLD LEO Audible Signal Patent Print Art |
| 1937 NEW HAVEN CLOCK Audible Signal Clock Art |
| 1942 E INGRAHAM Audible Signal Clock Art Print |
| 1961 HENRY Audible Fishing Lure Patent Print Art |
| 1939 CARL H FOWLER Audible Railroad Signal Art |
| 1940 SCULLY Audible Signaling Use With Tanks Art |
| 1952 NICORVO Demountable Electric Audible Art |
| 1951 CHRISTIAN Audible Electric Signaling Art |
| 1953 AFEO LITE CORP Audible Visible Alarm Art |
| 1948 POOLE Electromagnetic Audible Signal Art |
| 1945 GEN MOTORS CORP Audible Stall Indicator Art |