Abstract: This invention relates to a high efficiency apparatus for manufacturing an aqueous wood smoke solution in the form of a liquid smoke desired concentration by burning wood, wooden chips or sawdust in a limited amount of air. Wood consumption per unit of liquid smoke is significantly smaller comparing to conventional methods, while the air pollution is reduced to a negligible level.

Abstract: This invention relates to a high efficiency apparatus for manufacturing an aqueous wood smoke solution in the form of a liquid smoke desired concentration, and a method of obtaining such aqueous solution using the same apparatus by burning wood, wooden chips or sawdust in a limited amount of air. The apparatus and process disclosed herein is simple, safe, and clean. Wood consumption per unit of liquid smoke is significantly smaller comparing to conventional methods, while the air pollution is reduced to a negligible level.

Abstract: In an elevator, the buttons are disposed on an operating panel. In hallways, the call buttons are disposed on the call panel. Their function is to serve the user to select a preferred floor or to call the elevator car. In this invention, the floor selection and elevator call buttons have an additional “undo” function. This function is accomplished by pressing of the same button for the second time. If user has selected a wrong floor or changes his/her mind after selecting, the previous entry can be “undone” by pressing the selection button for the second time. The same principle applies to the call button. Both the selection and the call buttons behave as “on-off” switch on the circuit enabling selection, de-selection and re-selection of the same button for unlimited times.