WftW Compendium 4, 'Radio Communication Equipment in the Army' Foreign Equipment Data Sheets, Volume 13, Signal Equipment (Part 2: Russia and Switzerland) is a facsimile reprint of a German WW2 publication. It provide information on (captured) enemy signal equipment with an English introduction, table of contents and translation of original German sample pages. In Compendium 3, the first Part, equipment originating from Belgium, England, France and North America is covered. See also www.wftw.nl