| 1958 DORF Electrical Musical Instruments Patent |
| 1960 DEREUX Electrical Musical Instruments Art |
| 1966 PARK Tempo Control Electrical Musical Instruments |
| 1898 WESTON Case Electrical Instruments Patent 30147 |
| 1941 HAMMOND Keyboard Electrical Musical Instruments |
| 1962 FRILI AB Electrical Musical Instruments Art |
| 1959 DE Electrical Pickups Musical Instruments |
| 1937 JOHN Control Electrical Musical Instruments |
| 1955 TRIPLETT Cases Electrical Measuring Instruments |
| 1962 KINSMAN INC Electrical Musical Instruments |
| 1969 WARWICK Electrical Musical Instruments Art |
| 1952 HANERT Vibrato Electrical Musical Instruments |
| 1969 BRAND Electrical Musical Instruments Patent |
| 1951 CONN LTD C G Switch Electrical Musical Instruments |
| 1957 CHICAGO Electrical Musical Instruments Art |
| 1967 PETERSON Electrical Musical Instruments Art |
| 1956 CONN LTD C G Electrical Musical Instruments |
| 1927 LIFSHITZ Electrical Attachment Musical Instruments |
| 1967 COLUMBIA Electrical Musical Instruments Art |
| 1952 CECILE Reed Electrical Music Instruments |
| 1951 BOZAK Switch Electrical Musical Instruments |
| 1957 ANDERSON Electrical Musical Instruments Art |
| 1965 RICHARD Controls Electrical String Instruments |
| 1962 DORF Electrical Musical Instruments Patent |
| 1962 KOEHL Electrical Musical Instruments Patent |
| 1965 ATUK CORP Controls Electrical String Instruments |
| 1956 KRAUSS Electrical Tone Source Musical Instruments |
| 1956 BANTAR INC Electrical Pick Up Musical Instruments |
| 1890 WESTON Case Electrical Instruments Patent 30088 |
| 1956 CONN Electrical Tone Source Musical Instruments |
| 1952 HERBURGER Reed Electrical Music Instruments |
| 1937 NICHOLAS Control Electrical Musical Instruments |
| 1959 ROWE IND Electrical Pickups Musical Instruments |
| 1952 EMILE Electrical Pickup String Instruments |
| 1962 HEARLEY Electrical Musical Instruments Art |
| 1941 LAURENS Keyboard Electrical Musical Instruments |
| 1952 HAMMOND Vibrato Electrical Musical Instruments |
| 1956 KRAUSS Electrical Musical Instruments Art |
| 1956 MCBRIDE Electrical Pick Up Musical Instruments |
| Electrical Measuring Instruments and Meters Vol 2 -1912 |
| "Electrical Measuring Instruments" Vintage Book - 1940 |
| VINTAGE JEWELL ELECTRICAL RADIO INSTRUMENTS VOLTS METER |