求翻译：在二十世纪七十年代末期，我国五金行业内的科技情报工作者根据掌握的国外信息就提出了在我国开发吸油烟机的建议。限于当时各方面条件的制约，国内无一厂家开发这种产品。直到1984年7月，上海桅灯厂根据掌握的实物情报（台湾产吸油烟机样机）试制成功了我国第一台外排式吸油烟机，同年12月投入生产，当年产量为629台。上海成为我国最早开发和生产吸油烟机的地区。是什么意思？

In the late 1970s, China's hardware industry, scientific and technological information within the grasp of foreign workers, according to information put forward in our development proposals hood. Was limited to various conditions, none of the domestic manufacturers to develop this product. Until Jul

In the 1970s, my 5 Kim in the industry based on the science and technology information workers abroad on information presented in my Development cooking hoods. At that time limited to the structure, there is not a factory owners to develop such a product. It was not until July 1984, Shanghai masthea

In the 20th century 70's last stages, in our country hardware profession scientific and technical information worker proposed according to the grasping overseas information develops in our country attracts the lampblack machine suggestion.Was restricted in at that time various aspects condition rest

In the late 1970 of the 20th century, the hardware industry in our country's scientific and technical information workers based on available information on the recommendations made in China's development of range hood. Limited to the constraints of the prevailing conditions, domestic no manufacturer

In the late 1970s, China's hardware industry, scientific and technological information within the grasp of foreign workers, according to information put forward in our development proposals hood. Was limited to various conditions, none of the domestic manufacturers to develop this product. Until Jul