I have impressions, based on stuff I've seen, read about and handled, but I have no reference documentation, so my opinion is simply that.
The push plunger spring loaded pan primer as sold by Tow and others nowadays, is a modern invention, I think, perhaps invented during the second quarter of the 20th C.
Percussion cap dispensers, I believe, have been around since the American Civil War. The kidney shaped capper, I think, is a very old design, but the straight in-line capper is likely a modern invention. When was the coil spring invented, for example? The kidney capper works with gravity - no pushing spring.