ball & pebble mills
TRANSCRIPT
•föh^fß
^^^^^^M
^ΒβΒΙ
SIS msm ΒΒΪ
ι
li •ι
llk P^ ik
ITTSBURömPENNSYIiVANIA
187S C Η E M IC
ORDNANCE ? l V l b £ L c h Blocks. Proiectiles. Heavy Forgmgs, Breech
C H E M I C A L A N D E N G I N E E R I N G N E W S
TRANSCRIPT
•föh^fß
^^^^^^M
^ΒβΒΙ
SIS msm ΒΒΪ
ι
li •ι
llk P^ ik
ITTSBURömPENNSYIiVANIA
187S C Η E M IC
ORDNANCE ? l V l b £ L c h Blocks. Proiectiles. Heavy Forgmgs, Breech
C H E M I C A L A N D E N G I N E E R I N G N E W S