<s>
The	O
Derwent	B-Library
World	I-Library
Patents	I-Library
Index	I-Library
(	O
DWPI	B-Library
)	O
is	O
a	O
database	O
containing	O
patent	O
applications	O
and	O
grants	O
from	O
44	O
of	O
the	O
world	O
's	O
patent	O
issuing	O
authorities	O
.	O
</s>
<s>
DWPI	B-Library
manual	O
code	O
/	O
Indexing	O
-	O
a	O
custom	O
taxonomy	O
indicating	O
the	O
novel	O
feature	O
and	O
use	O
.	O
</s>
<s>
Derwent	B-Library
produces	O
its	O
own	O
proprietary	O
patent	O
classification	O
codes	O
,	O
called	O
manual	O
codes	O
.	O
</s>
<s>
Derwent	B-Library
indexers	O
add	O
standardized	O
4-letter	O
codes	O
to	O
DWPI	B-Library
records	O
to	O
represent	O
certain	O
patent-holding	O
companies	O
.	O
</s>
<s>
These	O
codes	O
are	O
not	O
available	O
for	O
all	O
companies	O
-	O
only	O
the	O
top	O
patent	O
holding	O
companies	O
have	O
these	O
standard	O
Derwent	B-Library
codes	O
.	O
</s>
