<https://shop.sylviamassy.com/product/acos-type-36-microphone-data-sheet-free-download-uk-50s-60s-crystal-piezoelectric-info/#product>
<http://schema.org/description>
"Here is the original issued data sheet for the Acos Type 36 crystal microphone. This is a hard to find data sheet, and today it is a FREE DOWNLOAD on the store web site. Enjoy!"
<https://shop.sylviamassy.com/product/acos-type-36-microphone-data-sheet-free-download-uk-50s-60s-crystal-piezoelectric-info/>