rmance. There are certain arrange- This key is absolutely proof against the danger of convey- the jointed frame. The drum carries a band or piece of ing dust tothe movement. By springing the jaws open all watch spring, which is attached to the opposite half of the frame, and serves to draw the two… … BIRCH’S SELF-ADJUSTING WATCH KEY. most of the work, they.did adopt machinery, but many DE LOCHT’S PANTELEPHONE. years too late. attending the use of the system is insignificant, since the “Then with regard to common pumps, they are now im- accumulations in the pipe or jaws of the key are at once…
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