Last Saturday, I bought a package of old plug fuses("house fuses") at a tiny grocery store in Livingston, Ky.(about 70 miles from here)-anyhoos, they're standard edison based plug fuses for home use, with a 10 amp rating, unusual,since the typical lower rating is 15 amps. They're made by Metropolitan Electric Mfg.,of Long Island New york. The box is very plain cardboard with red print. According to the box,the company was established in 1892. The box is a bit shopworn, but the fuses look like they were made yesterday. I'm guessing they were made in the late '20's or '30's,judging from the print style on the box. Any opinions?