Findings:
- Windows (operating system)
- real-time operating system
- Standard Operating Procedure
- operating profit
- The perfect operating system
- Pink operating system
- Regional Bell Operating Company
- Bell Operating Company
- operating ratio
- Operating Missions as Nodes on the Internet: IP in Space
- The Operating Theater
- Operating Systems (e2poll)
- Operating Room drama
- Operating Manual for Spaceship Earth
- International Union of Operating Engineers
- revenue
- Internal Revenue Service
- Revenue Protection Officer
- Software revenue recognition
- Traffic police as revenue collectors
- Revenue Solutions
- revenue cutter
- Internal Revenue Code
- Her Majesty's Revenue and Customs
- Inland Revenue
- Bureau of Internal Revenue Chart Of Commissioners
- An evening with Stan Feldman of the Internal Revenue Service
- Unix-like operating systems
- Domain Operating System
- Disk Operating System
- fringe operating systems
- Linux-based operating system
- Be Operating System
- M&M's standard operating procedure for bored engineers
- real operating system
- Train Operating Company
- Guardian Operating System
- Radar operating modes
- actual operating system locales
- Toy operating systems
- Operating system
- Operating Systems Design and Implementation
- Self-updating operating system
- "operating system" loophole in the GNU GPL
- They forgot to give me the operating system!
- Windows 95 Operating System Components
- Modern Operating Systems
- How an operating system boots
- Operating Instructions
- Net Operating Loss
- X-OS: eXtreme operating system
- The man behind the operating system
- standing but not operating
- Internetwork Operating System
- batch operating system
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