How Its Made: Quartz Used in Military Radio Communication - Vintage Technology Documentary
41:28
From Raw Crystal to Crystal Oscillator - Crystals go to War in 1943
7:38
How it's made: Radio Vintage documentary movie - year 1936
19:28
Hidden Crystals EXPOSED in Devices You Use Daily
20:06
15 Gemstones More Expensive Than Diamonds #2
20:21
Trying galena in a crystal radio
25:47
Secret Life Of Machines - The Radio (Full Length)
27:51
Most Satisfying Machines And Ingenious Tools
24:48