<s>
The	O
Communications	B-General_Concept
Machine	I-General_Concept
,	O
or	O
"	O
CM	O
"	O
,	O
is	O
a	O
mechanical	O
device	O
used	O
by	O
the	O
United	O
States	O
Navy	O
for	O
the	O
most	O
of	O
the	O
1920s	O
.	O
</s>
