Mass. Gen. Laws ch. 148, § 44: Firecrackers and pyrotechnical ship or railway signals

Section 44. Firecrackers and pyrotechnical ship or railway signals shall be included and classed as fireworks, but the provisions of the four preceding sections shall not apply to the storage of pyrotechnical ship or railway signals nor to the discharge, firing or exploding of the said signals when used for the protection of life and property.