1816

Samuel Clegg patents a "wet" gas meter

1843

Thomas Glover invents today's dry gas diaphragm meter

1974

World's First Silicon Chip Flow Sensor by Anton F.P. van Putten

2005

Thermodynamic anemometry: Nusselt-Reynolds measurements at micro-Kelvin resolution (PRSA London A, 2007, US Pat., 2007)

2006

Van Putten-Gas Energy Observatory presented at the Kiwa-Gastec Conference

2008

VPGEO certified for use in commerce conform Handbook 44 of NIST

2009

Market introduction of the VPGEO in a Wok restaurant in Eindhoven