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Dietzgen 1778a Slide Rule - Hazen-Williams Hydraulic.
1984.040.001
E. Dietzgen Co.
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Dietzgen 1740 8" linear slide rule
1986.081.001
E. Dietzgen Co.
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Dietzgen 5" linear slide rule
1992.052.001
E. Dietzgen Co.
circa 1920
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Dietzgen 10" linear slide rule
1992.052.003
E. Dietzgen Co.
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Dietzgen B-1734 linear slide rule
2007.016.006
E. Dietzgen Co.
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linear 9" Mannheim slide rule
IN-1288
E. Dietzgen Co.
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Dietzgen Log Log Decitrig linear 10" slide rule
IN-1298
E. Dietzgen Co.
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