Paul,

I don't know is it will answer ypur question directly, but there is this very interesting book: 
"Crystal Clear: The Struggle for Reliable Communications Technology in World War II"
https://www.wiley.com/en-us/Crystal+Clear%3A+The+Struggle+for+Reliable+Communications+Technology+in+World+War+II-p-9781118104644

Al

On 7/30/2023 9:28 PM, Paul Thekan wrote:

I recently obtained a box of close to 800 or more FT 243 xtals ,haven't counted them all yet, and was going through them looking for any useful freqs on the ham bands and noticed how many different companies were making xtals during the war. So far I've identified at least 45 companies making these xtals.

 Is there any info out there that talks about how many companies were involved in making these xtals. 

Thanks

Paul 

N6FEG 

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Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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