As Rocketeer has said these are the plates that would have been attached to a component, they give the manufacturers part number, the items serial number and the modification state of the specific part. The type of component they would have been attached to would be something that could be removed and replaced such as all the flying controls, engines, undercarriage, doors, pumps, props etc.
Once removed the item would have been sent to a workshop for assessment and then either repaired and returned to the stores for reissue (possibly back to the aircraft it came from) or scrapped, that repair cycle could happen any number of times.
Only if the item was in some way specific to a particular aircraft would the registration possibly be shown on the plate, an example might be a door that had been trimmed and altered to fit a specific aircraft, possibly due to that airframe differing from standard.
Richard
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