. QST . MILITARY TYPES Hermetic sealed, metal cased,in frequency ranges from 16kc to 100 mc. ^ Custom Oscillators, Crystal Filter Networks. ► Suppliers of Quartz for Ultra Sonic Trans-ducers. ► Complete customer engineering service pro-vided for quartz crystal applications. Write for technical catalog

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915