The coffee maker made of metal in 1930 is used to brew coffee directly including both ground coffee and boiling water without filtering grounds. This brewing form is considered an experiment for a taste of German premium coffee. It doesn't take much time to refine the coffee grounds but makes use of that fine powder to enjoy with the sugar pellets after extraction. The advantage of this coffee maker is reducing the time to filter coffee grounds, and its disadvantage is that it does not bring a strong taste of coffee after extraction. Therefore, other countries rarely believe in using this coffee maker.