19-inch rack - Wikipedia

Rack unit - Wikipedia

Rugged 19 Inch Rack Mount Case - Milrack Ruggedized Products

19-inch rack - Wikipedia

Rack unit - Wikipedia

What is a 19 inch rack? - RackSolutions

AxcessAbles 16U AV Rack Case with Wheels, Metal Studio Rack Cabinet, 19-Inch Universal Equipment Rack Case, Open-Frame Rack Option

12U Wall mount Cabinets Wiki and Usage

19-inch rack - Wikipedia

Uninterruptible power supply - Wikipedia

19-inch rack - Wikipedia

Why are 19-in. racks that size? - EDN