recovering deleted files that still have handles

user@host:~/tmp$ cp tmpfile{.orig,}
user@host:~/tmp$ less tmpfile
    ### ctrl+z was pressed ###
[1]+  Stopped                 less tmpfile
user@host:~/tmp$ stat tmpfile
  File: ‘tmpfile’
  Size: 3145            Blocks: 8          IO Block: 4096   regular file
Device: fc00h/64512d    Inode: 9708677     Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/  pandfi)   Gid: ( 1000/  pandfi)
Access: 2014-06-26 00:01:47.421591000 +0100
Modify: 2014-06-26 00:01:42.389591000 +0100
Change: 2014-06-26 00:01:42.389591000 +0100
 Birth: -
user@host:~/tmp$ rm tmpfile
user@host:~/tmp$ lsof | grep tmpfile
less      6143          pandfi    4r      REG              252,0       3145  9708677 /home/pandfi/tmp/tmpfile (deleted)
user@host:~/tmp$ cp /proc/6143/fd/4 tmpfile.recovered
user@host:~/tmp$ diff tmp
tmpfile.orig       tmpfile.recovered
user@host:~/tmp$ diff tmpfile.orig tmp
tmpfile.orig       tmpfile.recovered
user@host:~/tmp$ diff -s tmpfile.orig tmpfile.recovered
Files tmpfile.orig and tmpfile.recovered are identical