NORTON DOOR CONTROLS, Electronically Controlled, Left Hand, Electro- Mechanical Door Closer - 45J057|7123SZ x LH x 120VAC x 689 - Grainger
Duff-Norton - Mechanical Actuators
Norton Mechanical
Norton Part # 5610 689 - Norton 5600 Series Grade-1 Size 3 To Size 5 Sprayed Aluminum Electro-Mechanical Power Operator Rigid Arm Pull Side Mount - Door Closers - Home Depot Pro
Design of Machinery (McGraw-Hill Series in Mechanical Engineering): Norton, Robert L.: 9780079132727: Amazon.com: Books
How to Adjust the Norton Rixson 5700 Series Operator — Electronic & Mechanical Adjustments - YouTube