Activated Charcoal Gas Mask
Develops an activated-charcoal filter protecting soldiers from poison gases.
Historical biography archive · Updated 2026-11-03
Nikolay Dmitrievich Zelinsky Biography and Timeline
Follow Nikolay Dmitrievich Zelinsky through 2 dated historical records for Russia.
Nikolay Dmitrievich Zelinsky, historical timeline
A chronological timeline drawn from matching World History Database records.
2Distinct records
1 of 1Page
1915–1915Years on this page
1915
Chemical Protection Filter
The achievement marks chemical protection filter as an important Russian scientific milestone.
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.