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Gonstead Parallel Ruler
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Gonstead Parallel Ruler
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Gonstead Parallel Ruler

# 693 0009
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Gonstead Parallel Ruler

Gonstead Spirograph Parallel Ruler is made of heavy plastic that is mounted on sturdy steel rollers specially designed for Gonstead analytical marking of the 14? x 36? A-P and Lateral full spine x-ray film. The Parallel is divided into exact centimeter and millimeter measurements needed for pelvic and other spinal measurements. Features center 2-way centimeter line for reading sacral measurement. Rubber o-rings.