9th November 1905, Page 20
9th November 1905
Page 20
Page 20, 9th November 1905
Close
Abridgments Of Interesting Patent Specifications.
Boring Tool ; Governor; Controlling Device ; Valve Mechanism. No. 29,600A, dated December 3tst, ioe4. —Boring Tool.—Walker.—•For boring boiler tube-plates in such a manner that......