Whilst searching for a patent, from the 1920’s, I came across one registered in 1923 by S F Edge and AC Cars. It was for, what we now call, quarter-light windows. The adaptation, together with the in-built wind-up window channels, led shortly to the introduction of both the Aceca model and SFE Special (from the ‘standard’ 2/3 seaters). Here’s a summary, for interest:
Patent GB216283
216,283. Edge, S. F., and A.C. Cars, Ltd. April 11, 1923. Wind-screens.-The space between the edge of the inclined front screen 1 of a vehicle and the vertical edge of the side window 3 is filled by a triangular panel 4 detachably or otherwise secured to the body or front screen. On the rear and bottom edges the panel has fastening means such as press-studs 8 to connect the panel with the window guide 18 and with the body. The panel may be hinged to the front screen or may be permanently fixed to the door, and may form a guide for the sliding window
