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BS 9612 N021:1979

Отменен
Detail specification for resistance welded seal quartz crystal units for oscillator applications. DN, DZ, DQ and DP enclosures, 50 to 125 MHz frequency range. Fifth overtone thickness-shear mode, AT-cut, for operation over narrow temperature ranges (temperature controlled). Full assessment level — 12 стр.
ICS
31.140 Piezoelectric devices / Пьезоэлектрические и диэлектрические приборы