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Now this is the bit I need help with: As a result of this a gismo was developed which has subsequently fitted to all passenger jets which filters oxygen out of the air via fine filtersso that the resultant remaining nitrogen can be fed into the fuel tank airspace, reducing explosion risk.
This is untrue, and there is no such device fitted to the B747, nor mofidication used which would accomplish such a thing.
As nitrogen inerting is soon to be mandated on new aircraft in the US, i'd say that statement isn't entirely true.
The nitrogen generation system (as fitted to the 777) is in fact an oxygen reducing system. It lowers the amount of oxygen in the centre tank to an "acceptable" level.