A hemispherically shaped membrane switch assembly for attaching to generally hemispherical surfaces such as cathode ray tubes is disclosed. Also disclosed are a method and apparatus for forming the assembly. The assembly is comprised of two layers of transparent film having spaced-apart conductors on...http://www.google.ca/patents/US4598472?utm_source=gb-gplus-sharePatent US4598472 - Method for forming a hemispherically shaped switch assembly
