<s>
The	O
Elka	B-Device
22	I-Device
was	O
the	O
second	O
Bulgarian	O
electronic	O
calculator	B-Application
;	O
it	O
was	O
released	O
in	O
1966	O
and	O
its	O
serial	O
production	O
began	O
in	O
1967	O
in	O
the	O
town	O
of	O
Silistra	O
.	O
</s>
<s>
Weighing	O
8.5	O
kilograms	O
(	O
18.7	O
pounds	O
)	O
,	O
the	O
Elka	B-Device
22	I-Device
has	O
3	O
registers	O
and	O
operates	O
with	O
12	O
decimal	B-Application
digits	O
.	O
</s>
<s>
This	O
calculator	B-Application
has	O
a	O
plastic	O
case	O
,	O
a	O
nixie	B-Application
tube	I-Application
display	O
and	O
its	O
technology	O
is	O
based	O
on	O
numerous	O
phenol	O
boards	O
populated	O
with	O
hundreds	O
of	O
discrete	O
transistors	O
,	O
diodes	O
and	O
resistors	O
,	O
not	O
unlike	O
other	O
calculator	B-Application
models	O
developed	O
around	O
the	O
mid-1960s	O
.	O
</s>
