| http://www.w3.org/ns/prov#value | - sing sections 2 and 3 are disconnected and the casing section 3 moved downward to separate it from the section 2 the heating unit may be withdrawn with it, in which operation the terminals H and i5 slip downwardly and out of their receiving openings 23, whereby the heating unit may at any time be easily and conveniently re moved from the casing for cleaning, repairs or other purposes.
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