BS 9612 N004:1977 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 asse

standard by BSI Group, 10/15/1977