This special leatherbound edition, signed by the authors, has been print in 75 numbered copies. This book is a complete and exhaustive work on Italian “hot-bulb” engine tractors, born in 1921 and produced until 1959, and fits into into the series “Classical Tractors in the world”: here comes a complete and detailed history of Italian hot-bulbs and their producers. It is an unexplored topic no one had thoroughly studied, yet. Before the gallery of all models with technical technical data, the reader is presented with a technical preface featuring a glossary for an introductory approach to the topic. Colour pictures of restored units go with mostly unpublished sketches and brochures of the time.