| 1922 CAVINESS Horn Amplifier Phonographs Art |
| 1927 ENGLUND REUBEN Amplifier Patent Print Art |
| 1923 LEFEBRE EDWARD Amplifier Patent Print Art |
| 1959 WURLITZER CO Electronic Piano Amplifier Art |
| 1926 JENSEN VERNON Amplifier Patent Print Art |
| 1929 JOSEPH BERG Horn Amplifier Patent Print Art |
| 1928 JOSEPH PLATT Amplifier Patent Print Art |
| 1940 WURLITZER CO Tone Amplifier Pianos Art |
| 1927 POOLEY COMPANY Amplifier Patent Print Art |
| 1921 EDWARD Amplifier Phonographs Like Art Print |
| 1924 SANDELL HENRY Amplifier Patent Print Art |
| 1930 COLUMBIA PHONOGRAPH IN Sound Amplifier Art |
| 1925 KLACZYNSKI Sound Amplifier Patent Print Art |
| 1939 KUHLENBECK Amplifier Tone Regulator Art |
| 1929 LYON FRED Sound Amplifier Patent Print Art |
| 1927 RALPH Loud Speaking Wireless Amplifier Art |
| 1927 MARIA Horn Trumpet Acoustic Amplifier Art |
| 1955 ERIK Recoil Amplifier Machine Guns Art |
| 1922 STARK Horn Amplifier Phonographs Art Print |
| 1927 BACH JAMES Sound Amplifier Patent Print Art |
| 1969 SIOLES Voice Amplifier Toy Patent Print Art |
| 1927 WILLIAM A DARRAH Amplifier Enunciator Art |
| 1926 LAYTON Amplifier Telephone Receivers Art |
| 1952 NATHANIEL Amplifier With Muting Means Art |
| 1923 HORMISDAS Amplifier Talking Machines Art |
| 1929 UNITED REPRODUCERS CORP Sound Amplifier Art |
| 1930 BAUGHMAN Amplifier Coded Train Control Art |
| 1930 GODBERY JOSEPH Amplifier Patent Print Art |
| 1922 BELLE Sound Amplifier Talking Machines Art |
| 1923 VINCENZO Phonograph Amplifier Mounting Art |
| 1928 GRAEF ERNEST Amplifier Patent Print Art |
| 1947 SCOTT JOHN Piano Amplifier Patent Print Art |
| 1930 UNION Amplifier Coded Train Control Art |
| PPI Precision Power A 1200.2 amplifier art series |
| Precision Power PCX-4125 4 Channel PPI Amplifier Art |