There's not a simple way to do that in the data plugin currently. Closest thing would be this:
---- datalist ----
cols : Manufacturer
filter : %class%=ecr_112205-1
and : %pageid%=the:page:containing:the:entry
----
To fetch a single value from a single page you would need a new syntax component in the data plugin. It wouldn't be that hard to implement. Maybe open a feature request.