Germany's Deutsche Bank says Rocket Lab stock will double.After slumping at the start of the month, Rocket Lab (RKLB 1.54%) stock is getting its groove back post-holiday on Monday.Thanks to an over-the-weekend endorsement from over-the-ocean investment bank Deutsche Bank, shares of the small space rocket manufacturer gained 1.8% through 1:40 p.m. ET. What Deutsche Bank said about Rocket LabScanning the stock market and settling upon six industrials stocks "to buy & hold for the next 12 months," Deutsche inc ...