use strict;
use warnings;

my %seen;

while (<DATA>) {
	chomp;
	print "$_\n" unless $seen{$_}++;
}

__DATA__
30380868    N Sep 29               356200        AGEC682569   ATI       S
30380868    N Sep 29               356200        AGEC682569   ATI       S
71130740    N Sep  7               SM9481        AGEC683966   ATI       S
71130740    N Sep  7               SM9481        AGEC683966   ATI       S
32450045    N Jul 14               SN9672        AGEC685203   ATI       S
32450045    N Jul 14               SN9672        AGEC685203   ATI       S
36450223    N Aug 30               SU8329        AGEC685348   ATI       S
34680135    N Sep 30               349450        AGEC685442   ATI       S