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French inventor Henri Giffard (born 1825) invented the injector and the Giffard dirigible, an
UMG25A05_320

French inventor Henri Giffard (born 1825) invented...

This 1870s illustration shows the slide valve that was part of the steam engine. the Scottish
UMG25A05_358

This 1870s illustration shows the slide valve that...

This 1870s illustration shows the governor and throttle-valve that was part of James Watt's steam
UMG25A05_347

This 1870s illustration shows the governor and thr...

This illustration dates to the 1870s and shows Nasmyth's Steam Hammer. James Nasmyth was a Scottish
UMG25A05_324

This illustration dates to the 1870s and shows Nas...

The air mail.
UMG23A00_046

The air mail.

Air pump with two cylinders and valves.
UMG23A00_032

Air pump with two cylinders and valves.

Section of an air pump with two cylinders and valves.
UMG23A00_043

Section of an air pump with two cylinders and valv...

Air pump with two cylinders and valves.
UMG23A00_033

Air pump with two cylinders and valves.

Piston valves Air pump with two cylinders.
UMG23A00_042

Piston valves Air pump with two cylinders.

Kerting- Likfeld Gas engine, rear view and a cut of valves.
UMG23A01_426

Kerting- Likfeld Gas engine, rear view and a cut o...

Details d'une soupape pour un ballon de 5 a 8,000 m. cubes Charles Chavoutier, aèronaute, Paris, le 24 octobre 1868.- drawing of balloon valve shows 9 captioned views of
UMG22A27_245

Details d'une soupape pour un ballon de 5 a 8,000 ...

Donald Brooks
UMG22A04_105

Donald Brooks

Diesel engine by the Spanish manufacturer 'Pegaso', belonging to a railbus.
UMG21A15_341

Diesel engine by the Spanish manufacturer 'Pegaso'...

African American worker on Machine for extracting acid from phosphate
UMG20B34_013

African American worker on Machine for extracting ...

Ceremony at atyrau as the caspian pipeline consortium started pumping oil into the pipeline
UMG20B10_110

Ceremony at atyrau as the caspian pipeline consort...

Belarus, december 3 2002: an artificial heart valve, the production of which has begun at the belarussian concern 'planar,' optical and space technology materials are used in its design, for instance,...
UMG20B10_427

Belarus, december 3 2002: an artificial heart valv...

Kazakhstan, 27,03,2001: picture shows workers preparing to open the gate-valve of the 'tengiz-black sea' oil pipeline
UMG20B10_111

Kazakhstan, 27,03,2001: picture shows workers prep...

US Navy Subs pass through the Gatun Locks
UMG20A63_130

US Navy Subs pass through the Gatun Locks

African American worker on Machine for extracting acid from phosphate 1920
UMG20A57_485

African American worker on Machine for extracting ...

Loggin' Valves 1920
UMG20A61_411

Loggin' Valves 1920

Assembling Parts In Factory
UMG20A12_489

Assembling Parts In Factory

Fleming's First Vacuum Tube
UMG20A21_440

Fleming's First Vacuum Tube

Burbank And The Sonoma Geysers
UMG20A24_422

Burbank And The Sonoma Geysers

Branchipod valve toad ornaments
UMG12A27_075

Branchipod valve toad ornaments