What is the fine-grained topic of the following text: MULLENDORF, Austria – September 24, 2018 – Ulbrich Solar Technologies, global leader in the production of PV ribbon products for traditional solder, hybrid solder and conductive adhesive technologies, and Heraeus Photovoltaics, a leading technology solution provider for the renewable energy industry, have announced a joint manufacturing and sales partnership. Only return the topic.
Joint manufacturing and sales partnership between Ulbrich Solar Technologies and Heraeus Photovoltaics