| http://www.w3.org/ns/prov#value | - I was never sure of the reason for the rule, but presumably it was either: being quite awkward to remove and stow away, there was a risk that it would impede our exit in an emergency; or, that being fragile/ brittle it would be liable to shatter and injure people if in place during an aircraft crash. popsjumper (D 999999999)
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