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Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	U.S. Pat. No. 4,707,106 issued to Bruce K. Johnson, et al. on Nov. 17, 1987 discloses masking portions of the film within a first exposure, then exchanging a mask and exposing the second or other portions.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com