History of Quartz crystals(No. 3) - Riquartz

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- 1 (2023-08-19 (Sat) 20:51:45)
- 2 (2023-08-19 (Sat) 21:53:15)
- 3 (2023-11-19 (Sun) 15:45:38)
- 4 (2023-11-26 (Sun) 23:32:56)

Cylindrical can†

Also known as tuning fork type, these are more reliable & rugged.

Oval can†

Also known as XY flexure

NDK†

Specialising in quartz crystals, they are still in business. Date codes as follows

NDK 74F = April 1977