A special chapter in the history of the hour record was written by Marcel Berthet and Oscar Egg. From 1912 - 1914 the record was improved five times.  Maybe this fight between the two cyclists would have lasted even longer, but it was ended 1914 when World War I began.
I try to find out more details. Enjoy the article below by Owen Mulholland. I have directly linked to the bikeraceinfo.com Website

41.520 Marcel Berthet Paris 20.06.1907 42.122 + Oscar Egg Paris 26.08.1912 42.741 Marcel Berthet Paris 07.08.1913 43.525 Oscar Egg Paris 21.08.1913 43.775 Marcel Berthet Paris 21.09.1913 44.247 Oscar Egg Paris 18.06.1914 +  42.122 km is the "standard" value found in the literature. However, in the article below it is stated that the remeasured value was 42.360 km

Oscar Egg