Reichs-Betriebsnummer for ammunition?

Were the WWII German Reichs-Betriebnummern also assigned to ammunition manufacturers? I’m researching the markings and codes on a K-98 bayonet, scabbard and frog and this subject came up. The bayonet and scabbard have the typical German three letter manufacturer codes, but the leather frog only has a RBNr. Would a manufacturer such as Polte have a three letter code AND a RBNr? Also, is there a list of RBNr that identifies the manufacturers like there is a list for the letter codes?

Thanks and I hope this did not go too far off-topic…