For your consideration is this vintage flow meter. I don't know much about these so I will give you all the information I find on it. Fischer & Porter, Hatboro, PA USA.
RR-055-12 CAR GRVG TOOL Right Hand Style Applications Ideal for internal grooving of retaining rings, O-rings or parker seals. Features The lockdown flat automatically locates this tool on center. Projection P: 3/8" shank: .100" Product Specifications Item # 21-101-735 Catalog Price $57.04
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