Feldpost Number Identification help

[Bandit]

Hello everyone.
I was looking over a gasmask canister and I remembered it had feldpost number painted on the inside. I was wondering if anyone could help me decipher it. I'll write everything that is written on the replacement lens cover.

IV/30 - would this mean IV company of the 30 regiment?
Amd.
Feldhaüser
L.42842

and as an interesting note on the bottom of the canister there is a name written, well actually two, one is in paint and the other with faded pencil.
The painted one is Kühn Hubert, and the pencil one I believe says Lotte Feldhaüser.

Clearly this cannister was reused and Kühn Hubert, possibly both belonging to the same unit?

Thanks for any help
-Patrick

[Hank C.]

42842

(30.7.1941-28.2.1942) 1. Batterie Reserve-Flakscheinwerfer-Abteilung 399,
(12.3.1943-7.9.1943) 1. Batterie Flakscheinwerfer-Abteilung 399,
dann 1. Batterie Flakscheinwerfer-Abteilung 399 (o).

[Bandit]

Thank you very much for that. Out of curiosity where does one find what feldpost number belongs to which regiment etc?
Thanks
-Patrick

[Hank C.]

There's a program on disk that has them...it's about 12mb big, I think.

Sometimes just by googling you can also find 'em. But that also takes a bit of luck for many.

best
Hank