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A Balanced Diaphragm Type of Maximum Cylinder Pressure Indicator (1930)
NASA Technical Reports Server (NTRS) · leaf 9
Fig.2 N.A.O.A. Technical Note No.359 … Fig.2 Pressure element N.A.C.A. diaphragm type maximum pressure indicator.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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