Question: What was a cartridge developed for the Browning .50 caliber machine gun in the late 1910, was banned in California which led to the adoption of a French rifle cartridge developed by Eric Danis? 
Related documents: [0]  [DOC] The .510 DTC EUROP is a French rifle cartridge developed by Eric Danis in order to comply with firearms legislation in Europe which regulates .50 BMG rifles. In response to the .50 Caliber BMG Regulation Act of 2004, which banned future sales of .50 BMG shoulder-fired rifles in California, long-range shooters in that state have begun to adopt this cartridge as a manner of following the new legislation. [END] 
[1]  [DOC] The .50 Browning Machine Gun (.50 BMG, 12.7×99mm NATO and designated as the 50 Browning by the C.I.P.) is a cartridge developed for the Browning .50 caliber machine gun in the late 1910s. Entering service officially in 1921, the round is based on a greatly scaled-up .30-06 cartridge. Under STANAG 4383, it is a standard cartridge for NATO forces as well as many non-NATO countries. The cartridge itself has been made in many variants: multiple generations of regular ball, tracer, armor-piercing (AP), incendiary, and saboted sub-caliber rounds. The rounds intended for machine guns are linked using metallic links. [END] 
Answer: 
.50 Browning Machine Gun
.50 Browning Machine Gun