De techniek zelf is ontwikkeld door de Nederlander Jaap Haartsen die bij Ericsson in dienst was in Emmen
Translation: the technology was develop by the Dutch Jaap Haartsen employed by Ericson in Emmen-Holland . Wikipedia
I don't know where Bluetooth was invented. I don't even think I know what it really is, but I won't try looking it up because the idea here is to GUESS, not research! lol But now that I've read all the above I don't know what to guess! So, I'll just look forward to the answer.
Translation: the technology was develop by the Dutch Jaap Haartsen employed by Ericson in Emmen-Holland . Wikipedia