【D14】Geodetic Length Instruments Calibration System
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【D15】Geodetic Angle Instrument Calibration System
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【D16】Frequency Stabilized He-Ne Laser Calibration System
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【D17】Long Scales Calibration System
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【D18】Laser Interferometer Calibration System
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【D19】Pitch Standards Calibration System
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【D20】Calibration System for Global Positioning System Satellite Receivers
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【D21】Step-Height Calibration System
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【D22】Thin Film Measurement System
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【D23】Precision Long Gauge Block Calibration System
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