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Re: Sort of...
Posted by Jim Mamoulides on November 29, 2017, 4:24 pm, in reply to "So this is basically ..."
The Esterbrook Plunger-Fill fountain pen works like the Imperial I: There is a short ink sac attached to the back of the section, the barrel itself acts as the sac protector and the plunger is a piston unit similar to a vacuum-fil pen. The design is nothing like the standard Sheaffer Touchdown unit, but it does use air pressure to compress the sac and a relief hole to allow the sac to expand and fill with ink.
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