Can anyone identify these drivers?

This is the woofer and midrange from a "Petroff Labs" speaker. Sorry, but I don't know the model.
Neither driver has any identifying lettering or stamped markings.
As you can see the foam has rotted from both.
I'd like to know what they are, as I don't want to throw out anything that could be refoamed if it was worth it.
The woofer is curvilinear in section, and most of the cone is a translucent plastic.
The dust cone is a sort of fine, stiff mesh.

Any ideas?

Doug
 

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