Borek said:
I am referring to specialized centrifuges for honey extraction.
Interestingly, this doesn't confirm what I remember:
http://chestofbooks.com/animals/bees/History/Invention-Of-The-Honey-Extractor-Continued.html
As a kid I used to go for vacations to district of Mazury, which - before the WWII - was part of Germany. I remember such a centrifuge in one of the neighbors houses. I remember cast iron parts with a date clearly visible, but perhaps I am mixing it with date stamped on some other device? Even if so, the centrifuge must have been made before WWII. In the houses around there were plenty of such things, and they were old. After the war farming technology was in many respects put back in time, it was many years before Polish industry was able to supply such devices, and their parts were no longer cast.
Your link points out there was a lot of honey extraction related activity in Germany as far back as 1868:
"Langstroth, among other Americans, at once recognized its value and soon had made a machine for his own use. He, apparently, first learned of the discovery through German sources, since his announcement in the
American Bee Journalin April, 1868, tells of 'a plan devised in Germany for emptying the honey from the comb, without injuring the comb. ' He gave a picture of his machine and an enthusiastic report of the success of the new equipment."
Later in the article another inventor, Cowan, mentions a Silesian inventor, Buhne-Lauben, showing that around 1888 some Americans are still looking to German inventors, observing what they're up to.
"In the same magazine (August 16, 1888), Mr. Cowan tells of his success with this first outfit, but explains that it was safe to extract only old combs because of damage to new combs through breakage. He then described a similar machine invented by M. Buhne-Lauben, of Schleisen. When Cowan invented reversible baskets the radial principle was dormant for many a long year."
So, from that, it's completely plausible to me some embodiment of the honey extractor was being manufactured in Germany between 1900 and 1920. In fact, it would be more surprising to find it wasn't, given the acceleration in invention/mass production at that time. Your memory is probably accurate.