lot of 3 old industrial vintage unusual Hubbell electrical sockets

Lot of three old industrial steampunk vintage, porcelain electrical receptacles outlet sockets. They all marked Hubbell. The four pronged socket is rated for 20 amps / 250 volts. The other two outlets are both rated for 10 amps / 250 volts or 15 amps / 125 volts. All three sockets are smeared or splattered with what we think is orange shellac.