It was fabricated in sheet steel with welded construction. These are often fabricated from spun metal or flexible aluminum ducting. The aluminum body panels were fabricated by Bertone. No data other than material that's clearly been fabricated has ever been presented. A classification system exists for ease of manufacture and interchangeability of fabricated threaded items. OFETs have been fabricated with various device geometries. Diffractive optical elements can be fabricated using diamond turning techniques. Countless everyday objects are fabricated from sheet metal. IMPATT diodes have also been fabricated from SiC. The chassis was fabricated of pressed steel. Thus, laser diodes are fabricated using direct band-gap semiconductors. In contrast, a porcelain veneer may only be indirectly fabricated. Some very deep sinks are fabricated by welding. However devices with multiple separate negative resistance regions can also be fabricated. He claimed that those stories had been fabricated.