|Note_en=Advertising for the [[Duofold]] model in the new ''[[streamlined]]'' version called ''[[Streamline Duofold]]'' and its ''conversion'' to a desk pen (called ''[[Convertible Duofold]]''). Mention also the [[Parker improvements|47-th improvement]], the [[Pressureless Touch]]. | |Note_en=Advertising for the [[Duofold]] model in the new ''[[streamlined]]'' version called ''[[Streamline Duofold]]'' and its ''conversion'' to a desk pen (called ''[[Convertible Duofold]]''). Mention also the [[Parker improvements|47-th improvement]], the [[Pressureless Touch]]. |