The Collaborative International Dictionary of English v.0.48:

Coopery \Coop"er*y\, a.
   Relating to a cooper; coopered. [Obs.]
   [1913 Webster]

         Coopery vessels made of wood.            --Holland.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coopery \Coop"er*y\, n.
   The occupation of a cooper. --Crabb.
   [1913 Webster] co-opt