If during the period that insurance is in force under this policy, or within forty-five (45) days prior to the inception date thereof, on behalf of the Insurer there be filed with and approved or accepted by the insurance supervisory authorities, in conformity with law, any changes in the forms or endorsements attached to this policy, or the rules or regulations applying thereto, by which this insurance could be extended or broadened, without increased premium charge, by endorsement or substitution of form, then such extended or broadened insurance shall insure to the benefit of the Insured as though such endorsement or substitution of form has been made.
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L Clause