|Note_en=Advertising for the [[Vacumatic]] model for its transparent barrel called ''Ever Visible Ink Supply''. Showing also a ''"Doubly Leakproof"'' ''"Parker [[Quink]] Safety Container"'' travel ink bottle. Explicit mention of patents {{Cite patent|GB|318982}} and {{Cite patent|GB|417546}}. | |Note_en=Advertising for the [[Vacumatic]] model for its transparent barrel called ''Ever Visible Ink Supply''. Showing also a ''"Doubly Leakproof"'' ''"Parker [[Quink]] Safety Container"'' travel ink bottle. Explicit mention of patents {{Cite patent|GB|318982}} and {{Cite patent|GB|417546}}. |