7.92x57mm Mauser - Different "linear" primer strikes

Here are some different “linear” primer strikes (7.92x57mm Mauser…)
So, different (L)MGs…?!?

Thank you .

1.
ps%20(7)

2.
ps%20(3)

3.
ps%20(1)

4.
ps

5.
ps%20(4)

6.
ps%20(8)

7.
ps%20(9)

8.
ps%20(10)

9.
dc%20(2)

10.
ps%20(2)

11.
ps%20(6)

oblong trail leaves here this machine gun:

If I correctly understood the question, my English is very bad)

So, to reformulate the question :

Do these different “linear” primer strikes (7.92x57mm Mauser …) indicate different “types” of (L)MGs ?

At least #4, #7 and #11 (the difference between these primer strikes and the other primer strikes is obvious !) …?!?

I know, the first “variant” is ZB 30 LMG, BUT…?!?

(Note: all of these “cartridges” ‘comes from’ the same “area” …)