Assertion list for term "last 20 years".

Results from Ascent++: 6
mechanical valve (subgroup of valve) CapableOflast 20 years 0.67
implant CapableOflast 20 years 0.44
heat pump CapableOflast 20 years 0.36
led CapableOflast 20 years 0.31
crown CapableOflast 20 years 0.21
wind turbine (subgroup of turbine) CapableOflast 20 years 0.16