A fire extinguishing kit includes a self-contained wall mountable fire-extinguishing device having a base plate with an upstanding igniter and a depending non-projectile thermal actuator. The base plate is surrounded by a hollow frangible hull, which in turn is supported by another base plate, which also supports from below a distal end portion of the depending non-projectile thermal actuator. The hollow frangible hull is loaded with a sufficient amount of a dispersible dry fire-fighting chemical agent to facilitate extinguishing a small-localized fire when dispersed by the isotropic explosive force of the igniter.

 
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> Wedge-type breechblock

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