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2. North American P-51 Mustang variants - Wikipedia

   en.wikipedia.org/wiki/North_American_P-51...

   In the United States, new moulding techniques had been developed to form streamlined nose transparencies for bombers. North American designed a new streamlined plexiglass canopy for the P-51B which was later developed into the teardrop shaped bubble canopy. In late 1942, the tenth production P-51B-1-NA was removed from the assembly lines.

3. Retractable roof - Wikipedia

   en.wikipedia.org/wiki/Retractable_roof

   A retractable roof is a roof system designed to roll back the roof of a structure so that the interior of the facility is open to the outdoors. [1] Retractable roofs are sometimes referred to as operable roofs or retractable skylights.

4. North American P-51 Mustang - Wikipedia

   en.wikipedia.org/wiki/North_American_P-51_Mustang

   Two 1,000-pound (450 kg) bombs and six 130 mm (5 in) rockets could be carried. They all had an original F-51D-type canopy but carried a second seat for an observer behind the pilot. One additional Mustang was a two-seat, dual-control TF-51D (67-14866) with an enlarged canopy and only four wing guns.

5. Flashing (weatherproofing) - Wikipedia

   en.wikipedia.org/wiki/Flashing_(weatherproofing)

   In earlier days, birch bark was occasionally used as a flashing material. [7] Most flashing materials today are metal, plastic, rubber, or impregnated paper. [8]Metal flashing materials include lead, aluminium, copper, [1] stainless steel, zinc alloy, other architectural metals or a metal with a coating such as galvanized steel, lead-coated copper, anodized aluminium, terne-coated copper ...

6. North American T-28 Trojan - Wikipedia

   en.wikipedia.org/wiki/North_American_T-28_Trojan

   On 24 September 1949, the XT-28 (company designation NA-159) was flown for the first time, designed to replace the T-6 Texan.The T-28A arrived at the Air Proving Ground, Eglin Air Force Base, Florida, in mid-June 1950, for suitability tests as an advanced trainer by the 3200th Fighter Test Squadron, with consideration given to its transition, instrument, and gunnery capabilities. [2]

7. HEPA - Wikipedia

   en.wikipedia.org/wiki/HEPA

   HEPA filters are designed to arrest very fine particles effectively, but they do not filter out gasses and odor molecules. Circumstances requiring filtration of volatile organic compounds, chemical vapors, or cigarette, pet or flatulence odors call for the use of an activated carbon (charcoal) or other type of filter instead of or in addition to a HEPA filter. [20]