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Steam engine indicator by Casartelli
1884
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Watt's Steam Engine indicator of very late form
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Richards' Steam Engine Indicator
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Steam Engine Indicator
1899
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Steam Engine Indicator
1870-1890
Steam Engine indicator by Dobbie McInnes Ltd
1908
Steam engine indicator made by Crosby Steam Gage and Valve Company
1890-1900
Steam engine indicator by Casartelli
"New" continuous drum steam engine indicator
1879-1912
Steam engine indicator
Steam engine indicator
1910