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History of the manufacturer  

Groot's Radiotekniske Laboratorium; København

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Name: Groot's Radiotekniske Laboratorium; København    (DK)  
Abbreviation: grootslab
Products: Others

Kai Stockfleth Groot's Radiotekniske Laboratorium, Peter Bangsvej 260, København, Valby.
Manufacturer of crystals of any kind, branded with the company name and his calling sign OZ7KG. Also: Groot´s Electrotechn. Laboratory; Copenhagen.


This manufacturer was suggested by Georg Richter.

Some models:
Country Year Name 1st Tube Notes
DK  39 Frekvens-Kontrol 92 X [3620 kHz]   Pluggable crystal with X-cut. Accuracy ±0,1% 
DK  50 Quartz Crystal 5A1   GEL Quartz Crystal 5A1; Frequency range see pictures. 


Further details for this manufacturer by the members (rmfiorg):

Advertisement in OZ of June 1939tbn_dk_groots_krytaller_oz193906.png