| 摘要 |
<p>Apparatus for controlling the opening and closing of windows in a greenhouse or other structure which includes temperature sensing means for producing a control signal, means for producing a second control signal corresponding to a temperature at which the windows are to be opened, means actuated by the windows for producing a third control signal, means comparing the third signal with the first and second signals to produce a comparison signal which functions to operate motors to open and close said windows.</p> |
