Rare Frank Coe Angle Bisector – Patent Allowed, Boonton NJ
One of the rarest patented bisector tools ever produced, this precision instrument was invented by Frank Coe of Boonton, New Jersey. All known examples bear only the marking “Patent Allowed,” underscoring its unique status among angle-measuring tools.
Key Features
- Marked Maker: Frank Coe, Boonton, NJ
- Marking: “Patent Allowed” on Metal
- Construction: Wood body with metal arms—sturdy, well-preserved mechanics
- Rarity: Extremely limited production; seldom seen outside top collections
Collector & User Appeal
- Historical intrigue: Reflects the inventive spirit of turn-of-the-century American toolmaking
- Precision layout: Designed for accurate angle bisecting in cabinetry, joinery, and fine woodworking
- Display or use: Equally at home in a curated collection or a working shop
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SKU: T12123Categories: Knives, Shop All, Squares
