Dowling (David Dowling) Model H-7 Universal Gear Hobber. Operator's & Setters Manual.
Dowling (David Dowling) Model H-7 Universal Gear Hobber. Operator's & Setter's Manual. Includes instructions for adjusting the index worm and wheel, the hobs and hobbing head positioning.
Dowling 242 Pantograph Engraver, Die Sinking and Copy Milling Machine. Manual
Dowling (David Dowling) Model 242 Pantograph Engraver, Die Sinking and Copy Milling Machine. Operating Instructions with maker's Sales and Specification Catalogue.