Meyer-Optik Görlitz and Plaubel
12 and 13 researched events on one shared scale. Meyer-Optik Görlitz 1896–present, Plaubel 1902–present.
The axis stretches where either maker has research and collapses where neither does, so a year sits opposite the same year on both. Event counts differ because research depth differs, not because one company did less.
Meyer-Optik Görlitz1896–present · 12 events · 2 concurrent threads
Plaubel1902–present · 13 events · 3 concurrent threads
Read either maker on its own: Meyer-Optik Görlitz · Plaubel