Unlike the RMT, the Schwarzkopf looping coasters all have/had individual lap bars, rather than 1 bar per row.
They were 100% safe, as proved when Thunder Looper's Belgian cousin suffered a one-in-a-billion failure and jammed upside-down. The riders were all held perfectly securely.
Lots of Schwarzkopf looping coasters operated like this - including the Looping Stars and Silver Arrows. My favourite coaster of all time, Magnum Force at Flamingo Land, had just lap bars when it was on the German fairs.
Other Schwarzkopf looping coasters, including Olympia Looping, Thriller, and The Bullet had/have a strange system involving a lap bar, and a pair of shoulder restraints, similar to the top part of an OTSR, which lower vertically onto riders' shoulders, using an accordian-style system.