2 Lux 5000 models
There were actually two cleaners with the 'Lux 5000' model name — Model C101K (non-automatic) factory-paired with pn Model N137B and Model C141C (automatic) with pn N137J. I'm unsure of the difference in pn models; could have been styling or components. Both models were designed for electric wands. It seems to me that the C141 & C152 models were sold by a third parties. Both were manufactured from circa 2000 to 2003.
The Lux 5500 — Models C141G and C152C (with outsourced motor) — factory-paired with pn N115Q and designed for non-electric wands was labeled "by Electrolux" and branded with the Aerus logomark, so that would have been made a bit later; say 2003-2004.
Incidentally, the model numbers of the tanks (along with other specs) are stamped on the inside of the bag door — often covered by the intake gasket. At some point a barcoded decal was also affixed near the exhaust port. The alphanumeric serial number (5 digit production number in between the 2-letter series) is stamped on the bottom.
