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HP 7440A
todo:
- ☑ needs electricity cable
- ☑ check if it works with 230V
- yes, it works with 230v, but it needs a special power supply (0v - 10v - 20v) - info in the hp museum
- ☑ search for operation manual
- ☑ 3d print pen holders
- ☐ mod: cutout plastic to use regular pens