| http://www.w3.org/ns/prov#value | - The leads extend through a rear wall H back of recess 53 in a somewhat similar mannor, that is through a suitable flame-proof seal or gasket '53 which may be of such shape as to be held by reason of its configuration in an opening in wall II. The seal 13 is preferably made of litharge and glycerin which hardens to form a strong flame resisting mass.
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