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二、三等标准双活塞式压力真空计

Verification Regulation of Standard Dual Piston Type Pressurevacuum Gauge (Grade Ⅱ&Ⅲ)
标准号:JJG 159-1994
Verification Regulation of Standard Dual Piston Type Pressurevacuum Gauge (Grade Ⅱ&Ⅲ)
标准号:JJG 159-1994