Masoneilan Valve Slide Rule

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Country of manufacture: USA,            Date of manufacture:____
Overall length: 21.7 cm,          Width: 5.6 cm,           Weight: 28.5 gms
Materials: all plastic
Cursor: 4.1 X 6.0 X 0.4 cms; all plastic; lines = one hairline on front, one on back
Scales: specialized
Condition: C3 (very minimal signs of use)
Came with: Original red plastic slipcase, three plastic info cards)

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