Apparatus for plugging a blast hole in an in situ oil shale reto

Blast plug

Blasting plug with plate members and plastic resin

Blasting stemming plug

Cartridge for bulling mine holes

Charge placement device

Conical plug for sealing blastholes in open cut mining

Debris free plug assembly for heat exchange tubes

Device for cladding tubes by means of an explosive process

Expansive demolition agent

In situ disposable gel canister

Inert stemming materials

Inflatable plugs for charging blastholes

Mechanical stemming construction for blast holes and method of u

Method and apparatus for blasthole stemming

Stemming arrangement and method for blast holes