Abex Survey has been serving the Jefferson County area providing land surveying services since 1972. Recently, Glen Northrop has decided to retire and Abex Survey has been acquired by Combs & Associates in Janesville, WI. Combs & Associates has been providing Land Surveying and Civil Engineering services in Janesville for more than 50 years. Considered one of the leading land surveying firms in south central Wisconsin, Combs & Associates employs a team of more than ten people with more than 100 years of combined experience.