With no explanation, label each line with "O", "location-other", "product-weapon", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
The
Maxim
gun
was
a
weapon
invented
by
American-British
inventor
Sir
Hiram
Stevens
Maxim
in
1884
:
it
was
the
first
recoil-operated
machine
gun
in
production
.
The:O
Maxim:product-weapon
gun:product-weapon
was:O
a:O
weapon:O
invented:O
by:O
American-British:location-other
inventor:O
Sir:O
Hiram:person-other
Stevens:person-other
Maxim:person-other
in:O
1884:O
::O
it:O
was:O
the:O
first:O
recoil-operated:O
machine:O
gun:O
in:O
production:O
.:O