In addition, BIAMAX became a leading industry in Greece, in areas including Quality Assurance, technical training, process documentation and Research & Development.

Although its main activity was vehicle manufacture (in the late 1970s its industrial sector employed more than 2,000), some of its subsidiaries were also involved in areas like tourist services, exports of farm products and shipping.

The very successful F series of city and inter-city buses (named after Fostiropoulos initial, a designation used earlier as well) was introduced in 1965 employing a ladder-type chassis developed by BIAMAX, and, as most of its products, Mercedes-Benz engines.

The company faced difficulties in the early 1980s when some Middle Eastern markets were lost but, mostly, due to the new laws allowing import of used buses in Greece.

The entry of Greece to the European Communities canceled the Greek "protectionist" laws for the local automobile industry and the duties for importing foreign vehicles.