Hello, I recently bought a very nice and almost unused HP-45 from a Swiss friend calculator collector and I noted its strange back instruction label... You can see it at this URL: http://utenti.tripod.it/gianmaria/45label.html Instead of usually English language it's written in German, calculator was made in USA but on the label there is "Made in Singapore 3,75 V 500 Mw", any suggestion about? Thanks!