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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