A cathode head assembly is provided for holding a matrix during electroforming of a replica on the surface of the matrix. The cathode head assembly has a support member with an outer diameter at least as large as the matrix to be replicated; a compressable seal member positioned about the outer diameter...http://www.google.es/patents/US4534844?utm_source=gb-gplus-sharePatente US4534844 - Electroforming apparatus
