<s>
The	O
PRX205	B-Device
(	O
PRX/A	O
)	O
is	O
a	O
processor	B-Device
controlled	O
reed	B-Algorithm
relay	I-Algorithm
telephone	O
exchange	O
developed	O
by	O
Philips	O
Telecommunicatie	O
Industrie	O
BV	O
(	O
PTI	O
)	O
in	O
Hilversum	O
during	O
the	O
late	O
1960s	O
and	O
early	O
1970s	O
.	O
</s>
<s>
The	O
last	O
PRX	B-Device
switch	O
was	O
taken	O
out	O
of	O
service	O
on	O
7	O
December	O
2010	O
at	O
Volendam	O
in	O
the	O
Netherlands	O
.	O
</s>
<s>
The	O
PRX	B-Device
digital	O
version	O
(	O
PRX/D	O
)	O
was	O
developed	O
during	O
the	O
early	O
1980s	O
in	O
PTI	O
's	O
laboratories	O
in	O
Hilversum	O
,	O
Brussels	O
and	O
Malmesbury	O
,	O
Wiltshire	O
but	O
only	O
went	O
into	O
limited	O
production	O
.	O
</s>
<s>
After	O
the	O
takeover	O
,	O
the	O
PRX/D	O
development	O
was	O
stopped	O
in	O
favour	O
of	O
the	O
AT&T	O
5ESS	B-Device
switch	I-Device
product	O
,	O
but	O
development	O
of	O
PRX/A	O
continued	O
for	O
some	O
time	O
afterwards	O
.	O
</s>
<s>
PRX/A	O
systems	O
were	O
installed	O
worldwide	O
including	O
many	O
containerized	O
versions	O
and	O
served	O
reliably	O
for	O
38	O
years	O
.	O
</s>
