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| Number | Title | Issue Date |
| 5044278 | Electrically ignitible cartridge system A cartridge has a case of an electrically non-conductive material. A head of the case is typically formed with a coaxial through bore seating a terminal assembly comprising an annular electrode within which is an annular insulator holding a central electr... | 09/03/1991 |
| 4998047 | Ignition circuit for explosive devices and the like An ignition circuit for explosives with a monostable multi-vibrator controlling a transistor in circuit with a battery and the primary winding of a switching transformer, with the secondary winding directly connected to spaced electrodes at the explosive.... | 03/05/1991 |
| 4355263 | Ignition circuit for explosive devices and the like An Ignition Circuit for Explosives with an Inverter circuit including a transistor controlled transformer circuit wherein a specific multivibrator circuit controls the transistor.... | 10/19/1982 |
