These set of three charts aims to evaluate the duration of Claude Neon Lights' contracts with various clients in the French Concession between Dec 20, 1935 and Dec 31, 1937. The figures are based on the regular lists of signs that Claude Neon Lights sent to the French Municipal Council between December, 20 1935 and December, 31 1937, plus a few scattered signs recorded in other files in the Shanghai Municipal Archives (French concession and International Settlement in 1931 and 1941).  Source: SMA (FC), U38-4-1114; SMA (SMC), U1-14-3261 (0246). The first pie chart ignores the boards for which we do not know the date of removal or end of contract. The second bar chart show the average, minimal and maximal duractions of contracts.