Analogue-sequencer

Hi again,

I'm a little confused about two ICs, which I can't find anywhere, maybe
because I'm not so convenient with all those ICs.
On the Mainboard, there is one 4051B and on the POT boards there are four
4051. Is there any difference? These are multiplexers, right? At
www.reichelt.de I found a CD4051BE, and from the datasheet I think is the
same as the 4051. Order number is MOS 4051. But what is the 4051B? At
www.conrad.de I found a C-MOS IC 4051, and looking at the Datasheet, it
turned out to be a Motorola MC14051B. So all these ICs are Multiplexers,
but what is the B for?

I can't find the DS1210 anywhere, when I search for it, I just get no
results at reichelt or conrad, or kessler. So could someone please give me
more information about that part?

Thanx a lot,
Stoffel