| 1968 LOBDELL Piezoelectric Transducer Patent |
| 1968 BOUYOUCOS Flexural Disc Transducer Patent |
| 1968 FRIDEN INC Keyboard Key Transducer Patent |
| 1968 ERIKSON Focused Contact Transducer Patent |
| 1968 ALLEN ALAN A HARRY Z MARX Audio Transducer |
| 1968 MAGNAFLUX CORP Focused Contact Transducer |
| 1968 HUGO RIES Audio Transducer Patent Print Art |
| 1968 GEN INSTRUMENT CORP Directional Transducer |
| 1968 GEN DYNAMICS CORP Flexural Disc Transducer |
| 1968 MAGNAFLUX CORP Piezoelectric Ultrasonic Transducer |
| 1968 CYR Electroacoustic Transducer Patent Print |
| 1968 RICHARDS Fetal Heart Transducer Method Manufacture |
| 1968 HEWLETT PACKARD CO Piezoelectric Transducer |
| 1968 LOBDELL Ultrasonic Transducer With Absorptive Load |
| 1968 WILSON Shaded Arrays Transducer Elements |
| 1968 MINCHENKO Electromechanical Transducer Art |
| 1968 COLBERT Piezoelectric Ultrasonic Transducer |
| 1968 STEWARD Keyboard Key Transducer Patent |
| 1968 YOUNG Phonocardiograph Transducer Patent |
| 1968 AQUASONICS ENGINEERING Electroacoustic Transducer |
| 1968 BUTLER Directional Transducer Patent Print |
| 1968 BRIDGES Underwater Transducer Configuration |
| 1968 BENDIX CORP Underwater Transducer Configuration |
| 1968 NASA Phonocardiograph Transducer Patent |
| 1968 HEWLETT Ultrasonic Transducer With Absorptive Load |
| 1968 ULTRASONICS LTD Transducer Mounting Patent |
| 1968 EDWARD Transducer Mounting Patent Print Art |
| 1968 TRUSTEES Electromechanical Transducer Art |