|Note_en=Advertising for the [[Duofold]] model in [[celluloid]] (called [[Permanite]]) versions, mentioning the ''[[Parker improvements|improvement 47]]'', for writing without force, the [[Pressureless Touch]]. | |Note_en=Advertising for the [[Duofold]] model in [[celluloid]] (called [[Permanite]]) versions, mentioning the ''[[Parker improvements|improvement 47]]'', for writing without force, the [[Pressureless Touch]]. |