<s>
Kodak	B-Algorithm
Retinette	I-Algorithm
is	O
the	O
name	O
of	O
a	O
classic	O
series	O
of	O
cameras	O
manufactured	O
by	O
the	O
Eastman	O
Kodak	O
company	O
.	O
</s>
<s>
They	O
were	O
introduced	O
in	O
1939	O
as	O
a	O
less	O
expensive	O
alternative	O
to	O
the	O
Kodak	B-Algorithm
Retina	I-Algorithm
series	O
.	O
</s>
<s>
The	O
first	O
models	O
were	O
of	O
the	O
folding	O
type	O
using	O
bellows	B-Algorithm
and	O
their	O
lenses	O
had	O
three	O
elements	O
as	O
compared	O
to	O
the	O
four	O
element	O
Tessar	O
lenses	O
(	O
meaning	O
four	O
)	O
of	O
the	O
Retina	O
series	O
.	O
</s>
