I am looking for any information on the Gebrüder Karl und (Gustav) Hermann
Pfeiffer who owned the Feuerwerksfabrik Gebr. Pfeiffer in Kröllwitz,Halle
circa 1884.
Hello George,
please find below an article I have found in a 'chronicle of Kr�llwitz' from 1963.
Additional information you will find in a web forum
http://www.feuerwerk-forum.de/archive/index.php/t-34858.html
and in an online newspaper
http://www.mz-web.de/halle-saalekreis/firma-pfeiffer-lieferte-kunstfeuerwerk,20640778,19016916.html
Hope you are able to read German 
Kind regards
Andreas