Plaubel and Schneider-Kreuznach
13 and 5 researched events on one shared scale. Plaubel 1902–present, Schneider-Kreuznach 1913–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.
Plaubel1902–present · 13 events · 3 concurrent threads
Schneider-Kreuznach1913–present · 5 events
2 spans collapsed, 10 years in total, where neither maker has a research point: 1903–1908, 1946–1949. 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: Plaubel · Schneider-Kreuznach