Dear Friends, in this thread you made "all in one".
So,
Friedmann & Lauterjung, the importer firm from NY, 1864-1909. The owners J.Christopher Friedmann and Charles R.Lauterjung. Trademark "Electric". The Electric Cutlery Co. was incorporated in 1889, as a separate firm.
Lauterjung & Sohn, Puma-Werk, Solingen, 1876-present days; registered 26th May 1900.
Lauterjung & Companie, Tiger Stahlwaren- und Waffenfabrik, Solingen, 1873-present days; registered 10th May 1900.