根据一机部下达的试制任务,南京计量仪器实验厂在南京林产工业学院及有关单位的协助下,经过一年多的努力,试制成国产SSZ—1型树木生长测量锥(生长锥)。一九八○年一月由南京市标准计量管理局主持召开了技术鉴定会,出席会议的有林业部规划局、吉林省林业局、四川省林业设计院、福建省林业设计 According to the pilot project issued by a machine department, Nanjing Measurement Instrument Experimental Plant under the assistance of Nanjing Forestry Industry Institute and relevant units, after more than a year of hard work, made a trial of domestic SSZ-1 tree growth measuring cone (growth cone). In January 1980, a technical appraisal meeting was held under the auspices of the Standard Metrology Administration of Nanjing Municipality. Attendance was attended by the Planning Bureau of the Ministry of Forestry, the Forestry Bureau of Jilin Province, the Forestry Design Institute of Sichuan Province, the forestry design of Fujian Province