File:Hydro 2.jpgDescriptionHydro 2.jpg English: Photo of Ei River Hydro Electric Plant area in Nicaragua ca 1959. Date between 1957 and 1961 date QS:P,+1950-00-00T00:00:00Z/7
File:Hydro-slotting-2.jpgthe author of patents for hydro-slotting perforation technology: US 8240369 B1 (Slot perforation system for oil, gas and hydro-geological wells) and US
File:SBB Re 6-6 Re 4-4 Gurtnellen.jpgroad 2198 1541 275 231 4497 2998 Reuss river 1596 1249 281 202 4497 2998 Hydro-electric power station (turbine/generator building) 3075 2222 545 360 4497
File:Jelovčan Small Hydro Plant 2.jpgCreative Commons Attribution-Share Alike 4.0 truetrue English Jelovčan Small Hydro Plant (Sln. MHE Jelovčan) in the Hleviše, Municipality of Logatec, Slovenia