REVOLVING MOLD BOARDS 



723 





Ji&ff/tx'^ir/^Ars/ 



L E. BDRDIX 

 RevclTlDg tfalilboard. 



t'ftunted JiHir 26. ISftD 





]^^=- 







J. P PETTIT 

 RerolviAS Moldbcani 



L. SREEN 

 RavolTing HoldbosrcL 



rftt«nud Not. 37. ItteO 



(51.712 I 



P«l«nled Mtf. 19. I&6) 





.Vt^ ft iA*fi^~ 



