Perrygraf Irving Goldfein Sewer Design Slide Rule

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Country of manufacture: USA,            Date of manufacture: ____
Overall length: 33.0 cm,          Width: 10.0 cm.,           Weight: 62.5 gms.
Materials: cardboard shell with cardboard slide
Cursor: 5.0 X 10.0 cms; All-plastic, wrap-around; lines = one on front + one on back
Scales: 20, Front Side Specialized
Front: Q [ Parts Full, L, H ] N=.015, N = .013, N = .011, T [ L, Parts Full, H ] N = .015, N = .013, N = .011
Back: A [ B, CI, C ] D, K
Condition: C5 (Signs of normal use)
Came with: instructions
Notes: Based On Kutter's formula. This slide chart looks like a Perrygraf but is not labeled as such.

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