<s>
The	O
rotary	B-Device
machine	I-Device
switching	I-Device
system	I-Device
,	O
or	O
most	O
commonly	O
known	O
as	O
the	O
rotary	B-Device
system	I-Device
,	O
was	O
a	O
type	O
of	O
automatic	O
telephone	O
exchange	O
manufactured	O
and	O
used	O
primarily	O
in	O
Europe	O
from	O
the	O
1910s	O
.	O
</s>
<s>
The	O
Rotary	B-Device
system	I-Device
used	O
1st	O
and	O
2nd	O
linefinders	O
;	O
when	O
a	O
customer	O
picked	O
up	O
the	O
phone	O
all	O
free	O
linefinders	O
in	O
the	O
group	O
drove	O
until	O
one	O
picked	O
that	O
customer	O
line	O
.	O
</s>
<s>
While	O
the	O
Panel	O
system	O
was	O
chosen	O
for	O
American	O
large	O
cities	O
,	O
the	O
Rotary	B-Device
system	I-Device
was	O
selected	O
for	O
use	O
in	O
Europe	O
and	O
manufactured	O
at	O
the	O
Bell	O
Telephone	O
Manufacturing	O
factory	O
of	O
Western	O
Electric	O
(	O
the	O
International	O
Bell	O
Telephone	O
Company	O
)	O
in	O
Antwerp	O
,	O
Belgium	O
.	O
</s>
<s>
However	O
the	O
British	O
General	O
Post	O
Office	O
standardised	O
on	O
the	O
Step-by-Step	O
(	O
SXS	B-Device
)	O
system	O
in	O
1922	O
,	O
and	O
subsequently	O
the	O
SXS	B-Device
Director	O
system	O
for	O
London	O
and	O
other	O
large	O
cities	O
.	O
</s>
<s>
The	O
Rotary	B-Device
system	I-Device
was	O
chosen	O
for	O
The	O
Hague	O
,	O
(	O
the	O
Netherlands	O
)	O
and	O
New	O
Zealand	O
in	O
1913	O
–	O
14	O
,	O
but	O
manufacture	O
was	O
disrupted	O
by	O
the	O
German	O
invasion	O
of	O
Belgium	O
.	O
</s>
<s>
Subsequently	O
,	O
at	O
Zurich	O
,	O
Switzerland	O
;	O
the	O
mechanical	O
registers	O
were	O
replaced	O
by	O
PDP-11	B-Device
computers	O
.	O
</s>
<s>
In	O
the	O
rest	O
of	O
the	O
United	O
Kingdom	O
,	O
the	O
telephone	O
system	O
was	O
operated	O
by	O
the	O
British	O
Post	O
Office	O
(	O
later	O
British	O
Telecom	O
)	O
,	O
which	O
had	O
installed	O
a	O
Rotary	O
exchange	O
at	O
Darlington	O
(	O
10	O
October	O
1914	O
)	O
and	O
Dudley	O
(	O
9	O
September	O
1916	O
)	O
,	O
but	O
subsequently	O
decided	O
to	O
use	O
the	O
Strowger	B-Device
system	I-Device
in	O
small	O
and	O
medium	O
cities	O
and	O
the	O
Director	O
system	O
in	O
London	O
(	O
from	O
1927	O
)	O
and	O
five	O
other	O
large	O
British	O
cities	O
.	O
</s>
<s>
A	O
Rotary	B-Device
system	I-Device
was	O
installed	O
in	O
Auckland	O
,	O
New	O
Zealand	O
in	O
the	O
central	O
city	O
telephone	O
exchange	O
(	O
WLT	O
)	O
in	O
Wellesley	O
Street	O
in	O
1924	O
.	O
</s>
<s>
Other	O
Auckland	O
exchanges	O
with	O
Rotary	B-Device
systems	I-Device
included	O
Devonport	O
1	O
and	O
2	O
(	O
DA1	O
and	O
DA2	O
)	O
and	O
Mount	O
Eden	O
1	O
(	O
MOD1	O
)	O
.	O
</s>
