Difference between revisions of "Patent for a Buehnenscheinwerfer, Willy Hagedorn, 1921 (Q31872)"

@@ description / en / description / en @@
-a spotlight with a diafragm.
+a spotlight with a diafragm and mirror.
@@ Property / Field @@
+lighting and projection
@@ Property / Field: lighting and projection / rank @@
+Normal rank
@@ Property / author @@
+Willy Hagedorn
@@ Property / author: Willy Hagedorn / rank @@
+Normal rank
@@ Property / Publication date @@
+November 1921^GregorianTimestamp +1921-11-16T00:00:00Z
Timezone +00:00
Calendar Gregorian
Precision 1 day
Before 0
After 0
-Timestamp
++1921-11-16T00:00:00Z
-Timezone
++00:00
-Calendar
+Gregorian
-Precision
+day
 Before
 After
@@ Property / Publication date: 16 November 1921^Gregorian / rank @@
+Normal rank
@@ Property / Copy available online @@
+https://worldwide.espacenet.com/patent/search/family/007165068/publication/DE374015C?q=pn%3DDE374015C
+Normal rank
@@ Property / Backup document @@
+DE374015C_Original_document_20230730220849.pdf
+Normal rank
@@ Property / Internal image @@
+DE_374015_C.png
@@ Property / Internal image: DE_374015_C.png / rank @@
+Normal rank
@@ Property / mentions @@
+iris
@@ Property / mentions: iris / rank @@
+Normal rank