Patent for a Buehnenscheinwerfer, Willy Hagedorn, 1921
type: Item
description: a spotlight with a diafragm and mirror.
Type of information: source
Field: lighting and projection
author: Willy Hagedorn
Publication date: 1921-11-16T00:00:00Z
Copy available online: https://worldwide.espacenet.com/patent/search/family/007165068/publication/DE374015C
Internal image: DE_374015_C.png
mentions: iris
Canon documents public id: 1017