የሃይድሮሊክ በግ, ኢኮሎጂካል እና ኢኮኖሚያዊ ፓምፕ - እራስዎን ያድርጉ (DIY): እራስዎ ያድርጉት, ቤት, ሙቀትና ሙቀት
The hydraulic ram, ecological and economical pump - Do It Yourself (DIY): make it yourself !, Housing, insulation and heating