By Flaps [g04c 17/00f] Patents (Class 968/567)

Cross-Reference Art Collections

With date indication [g04c 17/00f2] (Class 968/568)
By a combination of different types of indicating devices, e.g., flaps and drums, etc. [g04c 17/00k] (Class 968/569)

There are no patents to show for this class.