Sonic Rock Blaster
The Sonic Rock Blaster (7312) uses sound waves to smash its way through solid objects. It would have made sense for Hasbro to have included hearing protection along with the face mask that came with the set. Later issue examples used a vinyl rather than elastic belt. The set below is interesting in that it has the elastic belt on the waist pack, and the later rubber strap on the face mask. The set was reused for the 1975 Mine Shaft Breakout set with a different color waist pack. If you can share a picture of the later orange packaging, please contact me!