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$VAR1 = [
          bless( {
...
                 }, 'HostSystemIdentificationInfo' )
        ];

my $add_info = $host_view->summary->hardware->otherIdentifyingInfo;

foreach (@$add_info) {
  if (  $_->identifierType->key eq "ServiceTag" ) {
     print $_->_identifierValue , "\n" ;
  }
}