Solved: PN #302 -- Schleiff Casco-Puffer

[pnegyesi]

Please tell me what's going on here. Who's the inventor and what did he invent?

[pnegyesi]

Experts?

[bentleybob]

This is a rubber bumper invented by the Dutch Overman company, which was supposed to absorb impacts up to 40 km/h, and actually gave one a reduction on the insurance fee. Many foreign companies took out a patent license for it, and no doubt they were sold in many countries under different names. There is a Hotchkiss in the Louwman Museum in the Netherlands who still has this bumper (see their site)
 

[pnegyesi]

It is a rubber bumper, but my source gives me the name of another - not Dutch company. So one point for bentleybob but I leave the puzzle open for other names

[tonyola]

The first tree-hugging car. Mercedes was showing even in the 1920s that it could be eco-friendly. 

[D-type]

Kleber made rubber things

[pnegyesi]

Not by Kleber

[D-type]

Michelin?

[pnegyesi]

Not a tire/tyre manufacturer

[D-type]

Googling "Rubber" and "Protection" brings up the London Rubber Company, but somehow I don't think that's the answer 

[pnegyesi]

no, this is not the answer

[pnegyesi]

Professionals?

[João]

It's called "Casco-Puffer", an elastic bumper invented by Herr Schleiff.

[pnegyesi]

And you're right. Congratulations

[pnegyesi]

Some Maybach cars from 1928 with the Casco-Puffer