As a result of the Guided Missile Office's work, around 1950's, the Robot 302, 304, 310 and the interesting 315 were known. They were built by SAAB.

-The 304 was air-to-surface dropped from the Lansen aircraft. But Robot 315 was surface-to-surface, having to take off from the surface. It was naval.

“Robot 315”

-The cruise engine was a pulse jet, but for launching it had four solid fuel rocket motors installed inside the missile near its base. As the pulse jet was just behind them, the nozzle outlets were oblique as we see in the photo below.

“This detail distinguishes it from other missiles”