 His first mobile phone call was made to Joel S. Engel in April 1973.1973 Voicemail

1974 Heimlich maneuver

1974 Post-it note

1974 Scanning acoustic microscope

1974 Quantum well laser

1974 Universal Product Code

1975 Digital camera

The digital camera is a camera that takes video or still photographs, digitally by recording images via an electronic image sensor.Steven Sasson as an engineer at Eastman Kodak invented and built the first digital camera using a CCD image sensor in 1975.