Equipment for testing air ionizers
by Esa Mäkinen, Matti Lehtimäki, Veikko Rintamäki, Gunnar Graeffe, E. Mäkinen
Writing a summary for young readers…
For young readers
Book data: Open Library
by Esa Mäkinen, Matti Lehtimäki, Veikko Rintamäki, Gunnar Graeffe, E. Mäkinen
Book data: Open Library