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- https://www.ptra.com/pages/contact.htm (02 Sep 2021)
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713-393-6683
http://www.ptra.com/index.php/contact-us/ptra-cont... (09 May 2019)
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713.393.6689
http://www.ptra.com/index.php/contact-us/ptra-cont... (09 May 2019)
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713.393.6526
http://www.ptra.com/index.php/contact-us/ptra-cont... (09 May 2019)