Delivery warmer

Device for changing temperature of material therein

Device for changing temperature of material therein

Device for changing temperature of material therein

Device for collecting solar energy

Device for collecting solar energy

Device for heating food contained in a sealed container

Device for melting ice at a fish hole in the ice

Device for thawing ground

Device for the transmission of solar energy to a liquid medium

Device for transporting and storing cooked food and...

Device for utilizing the heat energy of solar radiation

Differential temperature controller for use in a solar energy co

Differential thermostatic controller for solar heating system

Disced friction heater

Disposable food heater

Disposable heat storage unit

Disposable heating unit for food containers

Disposable infant heel warmer

Disposable warmer and bag member for the same