| http://www.w3.org/ns/prov#value | - In order to enable the manual freeing of the lid from the casing at will a cam 31 generally rectangular crosssection is provided on a cross shaft 32 which extends outwardly and is engageable by any suitable key or plier, or by coin or other element in an outside slot 33 thereof so as to turn the cam 31 and thus pry the levers 19 apart and release the catch 18 from the keeper 17.
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