Generating smart-card stubs on a clean computer? and how to get the public key for a key on the card?

[Thomas Gries]

RE: http://lists.gnupg.org/pipermail/gnupg-users/2010-September/039488.html

"Generating smart-card stubs on a clean computer?"explains
/that you //need the public key plus a run of --card-status to generate 
the stubs.

But what if you_don't have the public key (for your key on the smart 
card) available ?__
_
Question:
_How can I generate & export public key/s from key/s on the card ?__
_
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