{HEAD ~ The principal object} of the present invention is to produce a face to face plate type swivel with an interposed frictionless bearing material at lower cost without any corresponding loss in simplicity of design, ease of assembly or strength of structure and to improve the ease of operation and {TAIL ~ ease} of maintenance 
is to improve
{ HEAD ~ The principal object } of the present invention is to produce a face to face plate type swivel with an interposed frictionless bearing material at lower cost without any corresponding loss in simplicity of design , ease of assembly or strength of structure and to improve the ease of operation and { TAIL ~ ease } of maintenance
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