Searching the online records of Instituto Nacional de la Propriedad Industrial I República Argentina, I can find four possibly relevant trademarks for 'RBM'. They yield the following information:

• In March 1987 Miguel Angel Mancardo applied for a trademark covering category 12 products (vehicles including bicycles). This appears to be an initial application not a renewal.
• In August 1999 Miguel Angel Mancardo applied to renew this category 12 trademark. This renewal expired in May 2010.

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• In December 1996 Miguel Angel Mancardo applied for a trademark covering category 7 products (machinery). Again this appears to be an initial application not a renewal.
• In March 2008 Walter Alejandro Mancardo applied to renew this category 7 trademark.

One might guess that RBM is/was a company owned by Miguel Angel Mancardo that was active in the bicycle component market at some time between 1987 and 2010. The company may then have passed to the next generation (Walter Alejandro Mancardo) and moved into manufacturing non-bicycle products.

It seems likely that the letter 'M' in RBM stands for 'Mancardo'. The letters 'RB' may be initials or they may describe the companies actrivities.

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• Publisher: Instituto Nacional de la Propriedad Industrial I República Argentina
• Inventor: Miguel Angel Mancardo
• Country: Argentina
• Date: Application March 1987
• Derailleur brands: RBM
• Derailleurs: none