Yes, this is a three gun tube. The rights to the Lawrence tube were obtained by DuMont, who was developing it for market with the name "Chromatron" when Paramount forced them to sell it to Sony. When Sony completed the development, they renamed it "Trinitron".

Imagine how different things would have been if DuMont had been allowed to complete the development and introduce the tube in DuMont color sets! David Sarnoff (RCA) must have had nightmares about the public watching Paramount color movies over the DuMont network on DuMont color sets.