American chargers with patent numbers

These are relatively common in the States. I assumed these chargers are for Model 1903 Springfields, by patent years. I decided to look up the patents and failed. But here is what appears to be an original sealed charger with .30-06’s. Don’t know what year because don’t want to break the seal. So are these patents for the chargers themselves and why did they stop putting them on the later production years?
Oh,yeh, the finger prints are not mine, I don’t ooze acid from my fingers.

US770497 Patent 9-20-1904 Cartridge Clip.pdf (171.8 KB)

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Your clips are for the M1903 and M1917 rifles. According to William S.Brophy’s book The Springfield 1903 Rifles, there were six patents associated with this item.
402,605, May 7, 1889
770,497, Sept.20, 1904
782,556, Feb.14, 1905
787,850, Apr.18, 1905
810,161, Jan.16, 1906
866,080, Sept.17, 1907.
Brophy has four pages showing a wide variety of these clips, but all he says about clips with patent dates is that they are sometimes found that way.
Perhaps the the patent dates were omitted after the patents expired?

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