Hi Doc,
I talked to the guy serviceing the extinguishers here where I work, and he said in addition to the visual inspection, if it is one of the dry powder types, make sure to take it out of its holder and turn it upside down and shake it, apparently the powder has a tendancy to pack, espescially in a situation like on a truck where it gets vibrated a lot,
They don't work so good if the powder is packed in the bottom.
Also sounds like you guys are doing a good job if the saftey inspector was so frustrated that he had to work to find something to gig you on!
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