<s>
The	O
Leica	B-Algorithm
copies	I-Algorithm
originate	O
from	O
the	O
Leica	O
camera	O
that	O
was	O
launched	O
by	O
Ernst	O
Leitz	O
,	O
Wetzlar	O
in	O
1925	O
,	O
using	O
the	O
Leica	O
39mm	O
screw	O
mount	O
of	O
26	O
threads	O
per	O
inch	O
(	O
25.4	O
mm	O
)	O
,	O
and	O
the	O
standard	O
35mm	O
film	O
.	O
</s>
<s>
In	O
1930	O
,	O
an	O
improved	O
model	O
with	O
interchangeable	B-Algorithm
lens	I-Algorithm
was	O
introduced	O
,	O
followed	O
a	O
year	O
later	O
by	O
the	O
fully	O
developed	O
Leica	O
II	O
with	O
standardized	O
film	O
to	O
lens	O
flange	O
distance	O
,	O
and	O
in	O
1932	O
the	O
basic	O
Leica	B-Algorithm
Standard	I-Algorithm
;	O
the	O
Leica	O
concept	O
was	O
established	O
.	O
</s>
<s>
The	O
post	O
1932	O
Leica	O
II	O
and	O
Leica	O
III	O
cameras	O
were	O
differentiated	O
by	O
the	O
latter	O
having	O
a	O
"	O
slow	O
speed	O
dial	O
"	O
on	O
the	O
front	O
of	O
the	O
camera	O
to	O
the	O
left	O
of	O
the	O
lens	B-Algorithm
mount	I-Algorithm
.	O
</s>
<s>
After	O
1940	O
,	O
with	O
the	O
introduction	O
of	O
the	O
Leica	O
IIIc	O
,	O
the	O
upper	O
body	O
was	O
die	O
cast	O
rather	O
than	O
stamped	O
and	O
the	O
visual	O
appearance	O
of	O
the	O
camera	O
changed	O
with	O
a	O
more	O
prominent	O
shutter-crate	O
around	O
the	O
lens	B-Algorithm
mount	I-Algorithm
--	O
this	O
was	O
not	O
covered	O
with	O
leather	O
as	O
in	O
the	O
previous	O
models	O
.	O
</s>
<s>
Several	O
of	O
the	O
Asian	O
brands	O
combined	O
the	O
viewfinder	O
and	O
rangefinder	B-Algorithm
features	O
,	O
this	O
was	O
not	O
done	O
on	O
the	O
Barnack	O
Leica	O
cameras	O
or	O
Soviet	O
copies	O
.	O
</s>
<s>
There	O
are	O
differing	O
opinions	O
on	O
when	O
the	O
Canon	O
(	O
Kwanon	O
)	O
line	O
of	O
cameras	O
became	O
Leica	B-Algorithm
copies	I-Algorithm
;	O
the	O
earliest	O
of	O
these	O
had	O
Leica	O
inspired	O
bodies	O
,	O
but	O
Contax	O
inspired	O
lens	B-Algorithm
mounts	I-Algorithm
and	O
Nikkor	O
lenses	O
.	O
</s>
<s>
1947	O
-	O
1959	O
:	O
The	O
Minolta-35	B-Algorithm
manufactured	O
by	O
Chiyoda	O
Kogaku	O
,	O
Osaka	O
(	O
24×32mm	O
at	O
first	O
)	O
.	O
</s>
<s>
1948	O
-	O
1977	O
:	O
Zorki	B-Algorithm
manufactured	O
in	O
USSR	O
by	O
KMZ	O
,	O
Krasnogorsk	O
.	O
</s>
<s>
1953	O
-	O
1961	O
:	O
Periflex	B-Algorithm
manufactured	O
in	O
England	O
by	O
K	O
.	O
G	O
.	O
Corfield	O
Ltd	O
.	O
Wolverhampton	O
.	O
</s>
<s>
Note	O
:	O
Some	O
35mm	O
rangefinder	B-Algorithm
cameras	I-Algorithm
were	O
also	O
partly	O
inspired	O
by	O
the	O
Zeiss	O
Ikon	O
Contax	O
.	O
</s>
<s>
Among	O
these	O
belong	O
the	O
1935	O
Canon	O
and	O
the	O
1948	O
Nikon	B-Algorithm
rangefinder	I-Algorithm
camera	I-Algorithm
.	O
</s>
