| 1933 SEVERY Electrical Musical Instrument Patent 9234 |
| 1958 DORF Electrical Musical Instruments Patent |
| 1938 TRAITWEIN Electrical Musical Instrument Patent 11 |
| 1947 HANERT Electrical Musical Instrument Patent |
| 1957 JOSE Electrical Musical Instrument Patent |
| 1962 LES Electrical Musical Instrument Patent |
| 1958 DORF Electrical Musical Instrument Patent 21335 |
| 1926 MILLS Electrical Musical Instrument Patent |
| 1941 MROZ Electrical Musical Instrument Patent |
| 1942 ZUCK Electrical Musical Instrument Patent |
| 1969 BRAND Electrical Musical Instruments Patent |
| 1940 BRUNO Electrical Musical Instrument Patent |
| 1936 LILJA Electrical Musical Instrument Patent |
| 1940 GEORGE Electrical Musical Instrument Patent |
| 1937 GUY Electrical Musical Instrument Patent |
| 1954 KOCK Electrical Musical Instrument Patent |
| 1943 HANERT Electrical Musical Instrument Patent |
| 1966 HARRIS Electrical Musical Instrument Patent |
| 1942 HENRY Electrical Musical Instrument Patent |
| 1951 HANERT Electrical Musical Instrument Patent |
| 1943 KOCK Electrical Musical Instrument Patent |
| 1954 HANERT Electrical Musical Instrument Patent |
| 1962 DORF Electrical Musical Instruments Patent |
| 1944 HANERT Electrical Musical Instrument Patent |
| 1962 KOEHL Electrical Musical Instruments Patent |
| 1953 DANIEL Electrical Musical Instrument Patent |
| 1952 PATTYN Electrical Musical Instrument Patent |
| 1941 HUGO Electrical Musical Instrument Patent |
| 1963 TOMCIK Electrical Musical Instrument Patent |
| 1940 SEVERY Electrical Musical Instrument Patent |
| 1941 DEMUTH Electrical Musical Instrument Patent |
| 1932 PETER Electrical Musical Instrument Patent |
| 1963 AMEDEO Electrical Musical Instrument Patent |
| 1942 HANERT Electrical Musical Instrument Patent |
| 1962 TENNES Electrical Musical System Patent |
| 1962 DORF Electrical Musical Instrument Patent |
| 1960 KAPPEL Electrical Musical Instrument Patent |