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Ringelmann smoke chart

A comparison of the Smokescope and the Ringelmann chart

Published Year

• 1930-1939 (1)
• 1950-1959 (1)

Subject

• Smoke prevention (2)

Author

• Ringelmann, Max, (2) *
• Burdick, L. R. (1) *
• Kudlich, Rudolf. (1)

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