It's amazing what you can find doing some patent searches.
Here's one from March 6, 1973, that's the date the patent was approved.
The application was submitted July 21, 1971.
Enlarge the picture and you can see the inventor names as Lawrence Brown and Leroy Piester.
Page two shows a generic Mark style cutaway showing the path of the ejection charge.
There are other pages of copy with all the legal language explaining the operation in layman's terms.
It's interesting that this style of line art has been used in patent applications since patents began.
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