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Alterations and Tests of the "Farnboro" Engine Indicator (1930)
NASA Technical Reports Server (NTRS) · leaf 15
Cam shaft Spark point •Circuit breaker era H1 Fig.l Diagrammatic sketch of Farnboro indicator with auxiliary circuits.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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