The 1975 Koehring Estimating Manual is a valuable resource for operators and technicians working with hydraulic excavators manufactured by Koehring. This manual provides detailed information on estimating and maintenance procedures specific to Koehring excavators from the year 1975. It serves as a guide for operating and caring for these specific models, ensuring optimal performance and longevity. Made in the United States, this manual is a rare find for those looking to enhance their knowledge and skills in working with heavy equipment.