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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Disk / Plate
Norman K. Spielman
Norman K. Spielman
USA
Plastic
est. 1960's
16.8 cm x 17 cm
Industrial Sanitation
Notes:
"Provides extensive moving scales for pipe diameter, flow rate, slope and other related calculations"
Image 1
Image 2
