How to ID German MG belts

[Claven2]

From top left to right, bottom left to right:
BSW = Berlin-Suhler-Waffenwerke
B = Carl Barth, Radeberg in Sachsen
993 = Siemens-Schukert, Berlin
adc = William Prym, Stolberg/Rheinland
agy = agy = Benn G.m.b.H, Bielitz O/S
92E = ?

Information

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[Badger]

From top left to right, bottom left to right:
BSW = Berlin-Suhler-Waffenwerke
B = Carl Barth, Radeberg in Sachsen
993 = Siemens-Schukert, Berlin
adc = ?
agy = ?
92E = ?

Agy? How about agv = Berg & Co., Solingen-Ohligs 41-44
Adc = William Prym, Stolberg/Rheinland
92E = don't know

Regards,
Badger