(under subclass 2) Subject matter directed to a mechanical control means which is actuated in the hole to explode the charge.
(1) Note. For purposes of this definition, mechanical control comprises any relative movement of mechanical parts which takes place below ground or in an inaccessible hole. For example, merely an electrical switch blade which is moved by some means in the hole relative to a contact is considered mechanical control for this definition.
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4.55, for subject matter directed to independent firing of plural charges or projectiles and which may include a firing control mechanically actuated in the hole.
