Below Are Useful Links:
Exemption Cylinder Listing (now referred to as Special Permit (SP))
List of DOT Licensed Retest Facilities
Dept. of Transportation (D.O.T) Comments about the DOT website should be addressed to DOT directly at this link: http://www.phmsa.dot.gov/about/contact
Full List of Cylinder Manufacturers "M" Numbers
Contact Information for DOT (pipeline and hazardous materials division)
Compressed Gas Association (CGA pamphlets)
National Assoc. of Fire Equipment Dist. (NAFED)
PSI Visual Inspection Seminars
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