Rodenstock and Taylor Hobson / Cooke
8 and 12 researched events on one shared scale. Rodenstock 1877–2013, Taylor Hobson / Cooke 1886–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.
Rodenstock1877–2013 · 8 events · 2 concurrent threads
Taylor Hobson / Cooke1886–present · 12 events · 2 concurrent threads
1 span collapsed, 5 years in total, where neither maker has a research point: 1940–1944. Collapsing keeps a short-lived maker readable beside a long-lived one; the years are removed from the drawing, never from the record.
Read either maker on its own: Rodenstock · Taylor Hobson / Cooke