72345600
Dec 8, 1969
Sep 1, 1970
MASTER SHEETS, STENCILS AND TRANSFER SHEETS, AND COMBINED MASTER AND TRANSFER SHEET UNITS FOR USE IN THERMOGRAPHICALLY IMAGING DUPLICATING SPIRIT AND OFFSET MASTERS AND STENCILS; ALSO COMBINED COPY SHEET AND TRANSFER SHEET UNITS FOR THERMOGRAPHICALLY IMAGING SINGLE COPIES AND FOR IMAGING PROJECTION TRANSPARENCIES
Building Construction and Repair