| 摘要 |
<p>An animal watering apparatus including a sidewall portion and an end portion forming a unitary structure, the sidewall portion including an inner wall section and an outer wall section spaced therefrom, insulating material disposed between the inner wal section and the outer wall section, electrical beating mechanism disposed throughout a major portion of the insulating material between the inner wall section and the outer wall section, and mechanism for connecting the beating mechanism to an electrical power source.</p> |
