Here's a B6 Youtube vid that was recently posted by Mario Perez:
Translated title and description from Portuguese to English:
"Electrolux Floor Polisher and Wax Year 1950 Blumenau
"In order not to give a very long video, I only used the felt discs to eliminate the classic "waves" formed by the bristle brushes after the filming. However, wax quality is approved after a laborious waste of old acrylic waxes that compromised the gloss.
Original peroba floor in a 1935 house, polyurethane varnish applied in 1984."
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Fyi ... The USA imported the Model B6 from Sweden in the 1950s prior to manufacturing its own Model B-7 in 1959. I've never seen a B6 advertised in an instruction manual, so promoting them was likely left to the salespersons.