Washington — US Customs and Border Protection selected four vendors to build concrete prototypes for President Donald Trump’s promised border wall between the US and Mexico on Thursday. Caddell Construction of Montgomery, Alabama; Fisher Sand & Gravel of Tempe, Arizona; Texas Sterling Construction of Houston; and WG Yates & Sons Construction of Philadelphia, Mississippi, will build prototypes of their designs for the wall at a location near San Diego. Construction may begin next month and will take 30 days. Each prototype will be about 9m long, and between about 5.5m and 9m high. The government will pay as much as $500,000 each for the mock-ups. Testing the four concrete prototypes will take about two months, said Ronald Vitiello, acting deputy commissioner of Customs and Border Protection, said at a press conference in Washington. In addition, contracts for as many as four other prototypes built of other materials will be awarded as soon as next week. Those prototypes will be revie...

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