German sentence to translate (3)

Could you help please?

nach vorhandenen Lehren
geändert 21/09/1920

modified from existing gauges

Is it correct ?

[In fact the second sentence is
geändert d. h Pause 21/09/1920

Is “pause” name of a guy
in this case it means
modified d.h. Pause 21/09/1920

Is pause the name Pause ?
If yes it means
Modified : it means Stop of manufacturing

Any Help ??

Pause is not a name.

I understand Pause either as a break (in time) or a drawing copy.


Pause = Lichtpause, old form of reprodution from an ink drawing made on semitransparent paper. That’s what I would say. As Hans said.

thanks to you both