| 11. | One was a modified platform with a prototype system known as " Outlaw Hunter ".
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| 12. | UP Aerospace and the New Mexico location were chosen to aid in testing prototype systems.
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| 13. | With other improvements, a full prototype system was first tested at sea in April 1937.
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| 14. | The first prototype system was crude, and its original clutch pack controller was a rheostat.
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| 15. | A prototype system will start with six LCD screens assembled to form a 3-by-6-foot display.
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| 16. | Everything looks ready to build the prototype system.
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| 17. | A prototype system was built south of Berlin, known as the "'Tremmen Radar Tower " '.
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| 18. | The main prototype system for intercepting enemy warheads failed one test and only partially passed another.
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| 19. | In 2014 researchers demonstrated a prototype system that uses copper electrodes and ammonia as the electrolyte.
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| 20. | Work then began on a prototype system.
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