BS 9612 N004:1977
Отменен
Detail specification for cold welded seal quartz crystal units for oscillator applications. DN, 47 U/2, DQ and DP enclosures, 0.8 to 20 MHz and 3.0 to 30 MHz frequency ranges. Fundamental thickness-shear mode, AT-cut, for operation over wide temperature ranges (non-temperature controlled). Full assessment level
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