An Impressum (from Latin impressum, "the impressed, engraved, pressed in, impression") is the term given to a legally mandated statement of the ownership and authorship of a document, which must be included in books, newspapers, magazines and websites published in Germany and certain other German-speaking countries, such as Austria and Switzerland.
...if this is a German company they generally have an "impressum"
the company is registered as "AISLER B.V.", normally its Dutch or Belgian companies that uses B.V.
Isn't lead-free HASL on 2 Layers the same price as ENIG, just shorter lead times? And 4 Layers is always ENIG. At least that is how it used to be with Aisler.