<s>
Sinclair	B-Device
Oxford	I-Device
was	O
a	O
range	O
of	O
low-cost	O
scientific	O
calculators	O
manufactured	O
and	O
sold	O
by	O
Sinclair	O
Radionics	O
in	O
England	O
from	O
1975	O
until	O
1976	O
.	O
</s>
<s>
In	O
November	O
1974	O
,	O
Gillette	O
wanted	O
to	O
enter	O
the	O
consumer	O
electronics	O
market	O
,	O
so	O
consulted	O
Sinclair	O
,	O
who	O
designed	O
for	O
them	O
the	O
Gillette	B-Device
GPA	I-Device
.	O
</s>
<s>
Both	O
the	O
Gillette	B-Device
GPA	I-Device
and	O
Oxford	O
100	O
models	O
used	O
8	O
digit	O
displays	O
with	O
red	O
light-emitting	O
diodes	O
(	O
LEDs	O
)	O
,	O
4	O
functions	O
,	O
9	B-Algorithm
volt	I-Algorithm
PP3	B-Algorithm
batteries	I-Algorithm
,	O
and	O
measured	O
.	O
</s>
<s>
Computer	O
Digest	O
recommended	O
using	O
a	O
much	O
larger	O
PP9	B-Algorithm
battery	O
,	O
but	O
that	O
meant	O
losing	O
the	O
portability	O
of	O
the	O
calculator	O
.	O
</s>
