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R D Holder Eng has been in the business for over 25 years. Roger D Holder MSME, CM is a member of the AZ Chapter of RSES in Goodyear, AZ. My cell phone number is 661-477-4902, Web store is shop.rdholder.com. I live in Goodyear, AZ and I am a Refrigerant and Air Conditioning Specialist Training Consultant at National Technical Transfer Inc, Englewood, CO, phone number 1-800-922-2820.
R D Holder Engineering