1) Dutch boy name 
Heinke or Heincke is given name or surname of: ...[diving equipment makers] Heinke was a series of companies that made diving equipment in London, run by members of a Heinke family. ==Timeline== ===Start of making diving helmets=== ===20th century=== ===WWII and after=== Unlike Siebe Gorman, who had only one series of serial numbers for their diving helmets, except for the last productions...