Here is the third part of the Industrial Era. These are techs that historically date from 1900-1925.
Date Tech Event
1900 Zeppelins First zeppelin flight
1903 Flight Wright Brothers first powered, sustained flight
1905 Theory of Relativity Einstein publishes
On the Electrodynamics of Moving Bodies
1905 Expressionism
Die Brücke
founded in Dresden
1909 Industrialism Mass production of Model T Ford
1910 Antibiotics First antibiotic: arsphenamine
1910 Modern Sanitation Darnall develops water purification by chlorine
1911 Cubism First exhibition by Cubists
1914 Trench Warfare World War I entrenchment
1915 Animation Cel animation technqiue developed
1915 Coast Guard United States Coast Guard created
1915 Aviation Junkers J 1 first all-metal aircraft
1916 Dada Cabaret Voltaire
1916 Armored Vehicles British Mark I tank
1917 Communism Communist revolutions in Russia
1917 Submarine Warfare Germany uses unrestricted submarine warfare
1918 Automatic Weapons Browning Automatic Rifle
1919 Fascism
Fascist Manifesto
published
1919 Modern Art Bauhaus School
1922 Plastics Bakelite produced
1922 Sonar ASDIC developed
1924 Surrealism
Surrealist Manifesto
published
1925 Dieselpunk Le Corbusier defines art deco (important visual influence)
1925 Consumerism Sloan introduces annual model years for GM cars
Probably the only one here that I'm not completely certain of is
Aviation. We have a group of different flight-related technologies: Flight, Aviation, Aerodynamics, Vertical Flight, Jet Propulsion, and Supersonic Flight, and I'm not quite sure necessarily where to place all of them. The other option for
Aviation is putting it off until 1929 and the development of instrumental flight. Let me know if there is anything else I should tweak.