I’ll join “Hoarse” in the non-expert category with
some additional info, and of coarse the results of
one of my other (non expert) pastimes – Patent searching.
Henry R. Gross
Chicago, Illinois
Spotlight
Patent number: 1702772
Filing date: Apr 28, 1927
Issue date: Feb 19, 1929
http://tinyurl.com/2dcwnlh
Henry R. Gross
Chicago, Illinois
Improved Mounting Bracket (Curved and Sloped Windshield Pillar)
Patent number: 1913075
Filing date: Feb 23, 1932
Issue date: Jun 6, 1933
http://tinyurl.com/25o8pz6
Henry R. Gross
Chicago, Illinois
Improved Mounting Bracket (Sloped Windshield Pillar)
Patent number: 1940348
Filing date: Feb 3, 1933
Issue date: Dec 19, 1933
http://tinyurl.com/345bv8q
Other mounting changes were covered in patents
filed by Henry R. Gross in 1947 and 1951.
Even though Henry R. Gross was president of Unity Mfg,
the first time that Unity Manufacturing was mentioned
in any of the patents referencing the 1702772 spotlight patent
was in a Aug 19, 1993 application covering a spotlight mount
and filed by “William” E. Gross. of Chicago
Unity are still alive and well as a major vehicle lighting manufacture.
Here is the link to Unity’s database going back to 1929, that includes
their early ads and flyers etc showing how the spotlight has evolved..
http://unityusa.com/historical_archive.htm
Art