elliptic hole with a dynamic edge crack
elliptic hole with a straight crack
elliptic hole with an edge-crack
elliptic hole with two straight cracks
half-elliptic spring(semi-elliptic spring)
A shrinkage method combining with medium-length hole and shallow hole
electron-hole liquid drop (=electron-hole droplet)
hole by hole blasting technique
hole by hole detonating
hole by hole initiating
hole by hole initiation
hole-by-hole detonation
Hole-by-hole initiating