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2. Packaged terminal air conditioner - Wikipedia

   en.wikipedia.org/wiki/Packaged_terminal_air...

   Packaged terminal air conditioner installed in a residential apartment. A packaged terminal air conditioner (PTAC) is a type of self-contained heating and air conditioning system intended to be mounted through a wall. [1] The first practical semi-portable air conditioning unit invented by engineers at Chrysler Motors. It entered the market in ...

3. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   [2] [3] Air conditioning is a member of a family of systems and techniques that provide heating, ventilation, and air conditioning (HVAC). [4] Heat pumps are similar in many ways to air conditioners, but use a reversing valve to allow them both to heat and to cool an enclosed space. [5]

4. Aircraft maintenance checks - Wikipedia

   en.wikipedia.org/wiki/Aircraft_maintenance_checks

   [3] [4] The MRBR is based on the analysis performed using ATA "MSG-3 Operator/Manufacturer Scheduled Maintenance Development" document (MSG-3 is for Maintenance Steering Group – 3rd Task Force). [4] The MRBR is an approved set of aircraft initial maintenance requirements as prescribed by the Appendix H to para. 25.1529 of 14 CFR part 25 ...

5. Package tracking - Wikipedia

   en.wikipedia.org/wiki/Package_tracking

   The service is provided for an additional charge [4] [5] but recently free service has been introduced as the cost of the associated technology has been decreasing. [ 6 ] Initially, a piece of mail was identified by the sending date and the addresses of the sender and the recipient; later tracking numbers came to be used for identification. [ 7 ]

6. Friedrich Air Conditioning - Wikipedia

   en.wikipedia.org/wiki/Friedrich_Air_Conditioning

   It was once the most high-efficiency room air conditioner made by Friedrich. [10] QuietMaster: Professional grade room air conditioners manufactured from the 1976 until 2010, when it was replaced by the S/M/L chassis Kühl models. They were manufactured in standard (3-speed analog), "Deluxe" (Deluxe was later called 4-Speed), "Programmable ...

7. 309th Aerospace Maintenance and Regeneration Group

   en.wikipedia.org/wiki/309th_Aerospace...

   In May 2007, the AMARC was transferred to the 309th Maintenance Wing, and the center was renamed the 309th Aerospace Maintenance and Regeneration Group (AMARG). [ 3 ] McDonnell F-4C-20-MC Phantom II AF Serial No. 63-7602 of the 4455th CCTS/4453d Combat Crew Training Wing, 16 July 1970.