| http://www.w3.org/ns/prov#value | - An apertured plate or sheet 34 r of a suitable resilient material, such as rubber or synthetic rubber, such as Neoprene, is included between the header sheets 26 and 28, and a similar plate of resilient material 36 is included between the plates 30 and 32 to provide composite tube sheets for the ends of the heat exchange tubes. 40 After the tube ends are inserted through the composite tube sheets
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