With no explanation, label each line with "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Surviving
manufacturers
are
Seagate
,
Toshiba
and
Western
Digital
(
WD
)
with
Toshiba
as
the
senior
participant
having
entered
the
market
in
1977
,
twenty
years
after
IBM
started
the
market
.
Surviving:O
manufacturers:O
are:O
Seagate:O
,:O
Toshiba:organization-company
and:O
Western:organization-company
Digital:organization-company
(:O
WD:organization-company
):O
with:O
Toshiba:organization-company
as:O
the:O
senior:O
participant:O
having:O
entered:O
the:O
market:O
in:O
1977:O
,:O
twenty:O
years:O
after:O
IBM:organization-company
started:O
the:O
market:O
.:O