The holder of a class four permit:
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(1) May sell and install liquefied petroleum gas equipment used on internal combustion engines, permanently mounted on mobile equipment only;
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(2) May not deliver liquefied petroleum gas;
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(3) May not sell or install any other type of containers or appliances;
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(4) Must comply with all applicable requirements; and
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(5) Must pay an annual permit fee in the sum of fifty dollars ($50.00).