en.wikipedia.org/wiki/List_of_experimental_aircraft

This is a list of experimental aircraft, or aircraft used or built to conduct experiments involving aerodynamics, structural materials, propulsion systems, configuration and equipment. Prototypes, pre-production and homebuilt aircraft described as experimental ... 17.1 X-planes; 17.2 Other US experimental aircraft. 18 See also ...

en.wikipedia.org/wiki/List_of_prototype_World_War_II_combat_vehicles

This list contains combat vehicles which never left the design phase or had an extremely limited production (usually < 10).

www.americanprototype.com

It is our intent to maintain integrity and professionalism in all of our dealings with employees, ... 2018 American Prototype and Production All Rights Reserved.

www.atpfirst.com

We handle projects of all sizes, utilizing any material, and cater to an array of industries within the USA. From Aircraft, DOD, Medical, Automotive, Optics, Lab ...

www.militaryfactory.com/aircraft/us-xplane-aircraft.asp

Page details many X-plane, experimental and prototype aircraft from United States aviation history. ... All-Weather Heavy Fighter / Night-Fighter Aircraft Proposal.

archpaper.com/2019/01/border-wall-prototypes-breached

Jan 11, 2019 ... As the Trump administration prepares to potentially declare a national emergency to jumpstart construction of a wall along the U.S.'s southern ...

archpaper.com/2018/08/border-wall-prototypes-tests

Aug 24, 2018 ... U.S. Customs and Border Protection (CBP), the DHS branch ... tests found that all of the concrete prototypes presented “extensive” construction ...

www.nbcnews.com/politics/immigration/test-steel-prototype-border-wall-showed-it-could-be-sawed-n956856

Jan 10, 2019 ... However, testing by DHS in late 2017 showed all eight prototypes, ... to an internal February 2018 U.S. Customs and Border Protection report.

www.theguardian.com/us-news/2018/jan/29/trump-border-wall-prototype-protest

Jan 29, 2018 ... Eight 30ft prototypes have been built in San Diego at vast expense, but ... enabling us all to feel empowered to bring about real change in the ...