1953 Wil-Nes Automatic Heater Ad
Wil-Nes (later turning into the Metaframe Co.) was the first to manufacture a heater and thermostat all in one glass tube!
From the November 1953 edition of The Aquarium.
Wil-Nes (later turning into the Metaframe Co.) was the first to manufacture a heater and thermostat all in one glass tube!
From the November 1953 edition of The Aquarium.