|Note_en=Advertising for the different versions of the [[Duofold]] model. Citing [[Advertised Feature::Pressureless Touch]] as [[Parker improvements|47-th improvement]] and the use of [[celluloid]], called [[Permanite]]. Left page. | |Note_en=Advertising for the different versions of the [[Duofold]] model. Citing [[Advertised Feature::Pressureless Touch]] as [[Parker improvements|47-th improvement]] and the use of [[celluloid]], called [[Permanite]]. Left page. |