PQ

1
PQ

• Blaise Pascal
• Gerald Pearson, Daryl Chapin, Calvin Fuller
• Phillips Corporation
• Alexander Ponatieff
• Valdemar Poulsen
• Edward Prew

2
Solar Cell
Calculator
3
Video Recorder
Compact Disc Palyer
4
Tape Recorder
5
Speedometer
6
R

• G. Ramazotti
• Rank Zerox
• Grote Reber
• Louis Renault
• John Rennie
• Jesse Reno
• Adolpos Rickenbacker
• Edward Roberts
• Wilhelm Rontgen
• Erik Rotheim

7
Periscope
Laser Printer
8
Radio Telescope
Gearbox
9
Clutch
Escalator
10
Personal Computer
Electric Guitar
11
X-Ray Machine
12
Spray Can
13
S

• Salter Weighing Co.
• Horace De Saussure
• Jacob Schick
• Igor Sikorsky
• Germain Sommelier
• Sony Corporation
• Percy Spencer
• Elmer Sperry
• Clement Street
• Thomas Sutton
• Joseph Swan

14
Bathroom Scales
Solar Heater
15
Electric Shaver
16
Helicopter
17
Pneumatic Drill
Camcorder
18
Microwave Oven
Autopilot
19
Chain Hoist
Single Lens Reflex Camera
20
Light Bulb