A Portable Electric Light for Sanitary Engineers amp; others to Examine Drains, Tubes and Pipes with

摘要

5263. Doughty, J. E. March 3. Drawings to Specification. Supporting lamps.-An incandescent lamp with flexible conductors is used to light drains, pipes, or other spaces, for examination by sanitary engineers or others. The lamp may be flushed down a drain.