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The Snorkel filling system was first introduced in replacing the touchdown filler on the TM 'Thin Model' fountain pens and during the first two years of production they were called TM Snorkels. The first Sheaffer Cartridge pen was developed by the Fineline division of the company in , and was simply called the Fineline Cartridge Pen. The cap was fitted with the new loss proof clip with inner spring action, which was designed to grip any thickness of fabric.