已制成的

The no staff and self-reducing tacheometer is a new type of surveying instrument designed and constructed by a group of teachers and students of our department.

无须跑尺自计视距仪是一种新式的测量仪器,经过研究,我们初步试制功。

Book sewing machine is one kind of book binding machines, by which the gathered signatures in paginal order from the collecting machine can be sewed to from book blocks.

锁线是将按顺序的书帖，通过锁线制书芯的械。