1.    No model rocket engines may be stored, sold, or offered for sale at retail unless such model rocket engine has been classified into one of the standardized engine codes listed in the chart in this section and unless such code is marked upon the model rocket engine.

2.    No model rocket engine will be sold, given, or delivered to any person under ten years of age. Model rocket engines bearing the standardized engine coding 1/4A, 1/2A, A, B, C, or D may be purchased by any persons who are ten years of age or older. Model rocket engines bearing the standardized engine coding E or F may be purchased only by persons who are fourteen years of age or over.