It has the status of a horizontal standard in accordance with IEC Guide 108.
IEC 60050-561 Ed. 1.0 t:1991
Original price was: $206.00.$103.00Current price is: $103.00.
International Electrotechnical Vocabulary – Chapter 561: Piezoelectric devices for frequency control and selection
International Electrotechnical Commission , 11/15/1991
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