<s>
The	O
Portable	B-Application
Commutator	I-Application
was	O
a	O
telecommunications	O
device	O
that	O
was	O
used	O
by	O
the	O
military	O
during	O
World	O
War	O
I	O
.	O
</s>
<s>
It	O
was	O
used	O
as	O
a	O
one-wire	O
telegraphic	B-Device
switchboard	I-Device
.	O
</s>
