Post 1490 Control Engineer's Slide Rule for Frequency Response Calcs. (same as Hemmi 301)

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Country of manufacture: Japan,            Date of manufacture: ____
Overall length: 29.6 cm,          Width: 4.0 cm,           Weight: 106.3 gms
Materials: Closed-body, plastic laminate over bamboo, metal stiffener
Cursor: 3.1 X 3.9 X 0.5 cms; metal-framed glass lens; lines = Three lines, front only
Note: original rule came wth four 3-line cursors; this example has only one cursor
Scales: 15, some specialized
Front: 10 in./ τ, ω [ CI, f, P, C ] D, A, db || 27 cm.
Slide Back: [ θ, θd, g^r, g ]
Gauge Marks: [ π, //, /, e, 785 ]
Condition: C3 (Very minimal signs of use)
Came with: Original cardboard box, leather case, manual, transparent scale accessory for freq.resp. calculations

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