TY - JOUR AU - P Delajoud AU - M Girard AU - Charles Ehrlich C2 - Metrologia DA - 2021-10-12 15:10:20 LA - en PB - Metrologia PY - 2021 TI - Early History of the Development and Characterization of a 50 mm Diameter, Gas-Operated Piston Gauge as a Primary Pressure Standard ER -