Dye layer for carbon paper, copying paper, hectographic paper, and the like, and method of making same
GB1081921A
Copy sheets and process for producing same
GB1025757A
Improvements in or relating to copying processes and sheets
ES282978A1
Improvements introduced in the procedure of calcado to machine and hand and sheets of precision prepared for its realization (Machine-translation by Google Translate, not legally binding)
ES280207A1
Improvements introduced in the calcado system without carbon paper employment (Machine-translation by Google Translate, not legally binding)
GB906187A
Improvements in duplicating papers
GB901028A
Improvements in and relating to sheets or foils provided with a reproductive layer
DE1203807B
Carbonless material
CA717915A
Copying process for transferring typewriting and handwriting from sheets or foils
CA813845A
Support members having a pigment coating suitable for writing transfer
CA794794A
Process for the preparation of note-paper for making copies
