A detonator system which includes an array of a plurality of discrete time delay relays (16) connected in series to one another, and a plurality of detonators (28) which are respectively connected to the array at spaced intervals (22).

 
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> Multi-Stage Mechanical Delay Mechanisms For Electrical Switching and the like

> Apparatus and method for penetrating oilbearing sandy formations, reducing skin damage and reducing hydrocarbon viscosity
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