Gas geyser with gas valve dependent upon water flow - has control block of three plates with in-built channels for gas and water
DE4008754A1
Ceiling lamp holder with clamp allowing upward movement only - imposes wt. on flexible bracket which is immobilised by ratchet arrangement preventing slip out of slots
DE3940350A1
Display board made of hinged section - folds into box shape, containing tripod stand, marking pens and other accessories
