<s>
The	O
IBM	B-Device
603	I-Device
Electronic	O
Multiplier	O
was	O
the	O
first	O
mass-produced	O
commercial	O
electronic	O
calculating	O
device	O
;	O
it	O
used	O
full-size	O
vacuum	O
tubes	O
to	O
perform	O
multiplication	O
and	O
addition	O
.	O
</s>
<s>
The	O
IBM	B-Device
603	I-Device
was	O
adapted	O
as	O
the	O
arithmetic	B-General_Concept
unit	I-General_Concept
in	O
the	O
IBM	B-Device
Selective	I-Device
Sequence	I-Device
Electronic	I-Device
Calculator	I-Device
.	O
</s>
<s>
The	O
IBM	B-Device
603	I-Device
was	O
developed	O
in	O
Endicott	O
,	O
New	O
York	O
,	O
and	O
announced	O
on	O
September	O
27	O
,	O
1946	O
.	O
</s>
<s>
The	O
commercial	O
interest	O
in	O
the	O
603	O
came	O
as	O
a	O
surprise	O
to	O
IBM	O
and	O
Thomas	O
Watson	O
Sr	O
,	O
head	O
of	O
IBM	O
,	O
felt	O
that	O
the	O
device	O
had	O
limitations	O
so	O
Ralph	O
Palmer	O
and	O
Jerrier	O
Haddad	O
were	O
hired	O
to	O
develop	O
a	O
more	O
refined	O
and	O
versatile	O
device	O
,	O
the	O
IBM	B-Device
604	I-Device
Electronic	I-Device
Calculating	I-Device
Punch	I-Device
.	O
</s>
<s>
The	O
IBM	B-Device
603	I-Device
was	O
the	O
predecessor	O
of	O
the	O
IBM	B-Device
604	I-Device
,	O
a	O
programmable	O
device	O
with	O
more	O
complex	O
capabilities	O
.	O
</s>
<s>
Throughout	O
the	O
following	O
10	O
years	O
IBM	O
would	O
build	O
and	O
lease	O
5600	O
of	O
the	O
IBM	B-Device
604	I-Device
.	O
</s>
