Patents on the manufacture of sponge- and foamrubber from latex 

 - Getr. Zählung 
 - Rubber Stichting : Communication  173. 173a .
 - Mededeelingen van de rubber-stichting = Mitteilungen der Kautschuk-Stiftung = Communications of the rubber foundation  173.173a .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Patentsammlung<br/>Kautschuk<br/>Schaumstoff