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- https://www.gti.com.ph/contact-us/ (29 Apr 2019)
- https://www.gti.com.ph/contact-us/ (24 Aug 2019)
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+6221 3004 0110
https://www.gti.com.ph/contact-us/ (29 Apr 2019)
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+6221 3001 5600
https://www.gti.com.ph/contact-us/ (29 Apr 2019)
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+63 2 846 1239
https://www.gti.com.ph/contact-us/ (29 Apr 2019)
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+63 2 846 2637
https://www.gti.com.ph/contact-us/ (29 Apr 2019)