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resource for cartridge history, Richard Binder’s website: Filling System Histories: Cartridge Pens - Cartridges date back to the 1920’s, very experimental - Didn’t really catch on until Waterman and Parker latched on to the idea, Waterman really nailed down the process but they were smaller and had less of a presence, Parker seemed to make it a staple in the mid-1960’s in the US - There wasn’t one international standard that everyone agreed on, companies were all vying for creating their own cartridges - Pelikan was definitely in the mix in those early days - There doesn’t appear to be an official ISO listing for ink cartridges, so the term may be more of a marketing term than a true international standard Check out the Full Version of Episode 124: https://www.youtube.com/watch?v=2nL4bu1OoCE Shop at GouletPens Store: http://www.GouletPens.com Read GouletPens blog: http://blog.gouletpens.com/ Like GouletPens on Facebook: https://www.facebook.com/TheGouletPenCompany Follow GouletPens on Twitter: https://twitter.com/GouletPens Follow GouletPens on Instagram: http://instagram.com/gouletpens Follow GouletPens on Pinterest: https://www.pinterest.com/gouletpens/