<s>
Elektronika	B-Device
B3-21	I-Device
(	O
Cyrillic	O
:	O
Электроника	O
Б3-21	O
)	O
was	O
the	O
first	O
Soviet	O
programmable	B-Application
calculator	I-Application
.	O
</s>
<s>
Production	O
was	O
stopped	O
in	O
1982	O
because	O
of	O
introduction	O
of	O
more	O
advanced	O
Elektronika	B-Device
B3-34	I-Device
.	O
</s>
<s>
accuracy	O
-	O
8	O
digits	O
in	O
the	O
Significand(7 if the value includes decimal dot )	O
,	O
2	O
exponent	O
digits	O
;	O
</s>
<s>
Elektronika	O
MK-47	O
-	O
rare	O
handheld	O
clone	O
of	O
B3-21	B-Device
,	O
allowing	O
the	O
storage	O
of	O
programs	O
on	O
magnetic	O
memory	O
cards	O
.	O
</s>
