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Vintage diagram of a Dobbie-McInnes Indicator #250584322
Description
Vintage illustration diagram showing the parts of a Dobbie-McInnes Indicator. This instrument is typical of the mechanical indicators used by engineers to test and improve the performance of internal combustion engines. It was made in Scotland in 1921 by Dobbie McInnes and Clyde and used in the maintenance of oil engines at a Kempsey power station.
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