i quote from
this article (from 2012) in Fahrradzukunft:
Originally Posted by Fahrradzukunft
Sanyo was known for reliable drum/roller dynamos in the 70's and 80's and has stayed behind the scenes in the hub dyno market, producing hubs named SRAM i-light and Dahon Joule. Recently, they started selling under their own name a hub called H27
As Panasonic took over Sanyo, besides now offering eneeloop NiMH batteries, Panasonic offers dyna hubs as well. What Sanyo did (and maybe Panasonic still does) is similar to SP (whose hubs were sold under different brand names (e.g., Biologic, Supernova) with usually only slight changes on e.g. improved sealings)
Hope this helps