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Halon is a commercially available fluorocarbon.
Brand or manufacturers names used in this Letter are for descriptive purposes only and do not constitute endorsement by the USGS.
Two views of the attachments lying on their sides. (A) The entrance–exit port and flange are facing the viewer front-on, the 45° mirror is in place, and the location of the sample cup is seen on the left. (B) The attachment viewed with the front-surface mirror removed. The elliptical opening formed by the intersection of the two cylindrical holes is evident.