Inventions Joseph John O'Connell

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^ o connell, joseph john. telephone exchange apparatus, patent no. 417,271 (pdf). united states patent office. 
^ j.j. o connell. testing apparatus telephone exchange switches (pdf). united states patent office. 
^ o connell, joseph john. telephone-exchange apparatus, patent no. 430,747 (pdf). united states patent office. 
^ o connell, joseph john. telephone-exchange key board apparatus, patent no. 430,748, (pdf). united states patent office. 
^ o connell, joseph john. metallic circuit test , time signal telephone exchanges, patent no. 454,016, (pdf). united states patent office. 
^ o connell, joseph john. telephone switching apparatus , circuit (pdf). united states patent office. 
^ o connell, joseph john. switch , circuit telephone exchanges, patent no. 515,531 (pdf). united states patent office. 
^ o connell, joseph john. signaling apparatus telephone exchange circuits, patent no. 587,226 (pdf). united states patent office. 
^ o connell, joseph john. telephone exchange apparatus, patent no. 544,901 (pdf). united states patent office. 
^ o connell, joseph john. signaling circuit, patent no. 555,707 (pdf). united states patent office. 
^ o connell, joseph john. telephone trunk circuit, patent no. 587,226 (pdf). united states patent office. 
^ o connell, joseph john. signaling apparatus telephone switchboards, patent no.652,977 (pdf). united states patent office. 
^ o connell, joseph john. apparatus telephone switchboards, patent no. 645,758 (pdf). united states patent office. 
^ o connell, joseph john. calling apparatus party telephone-lines, patent no. 647,515 (pdf). united states patent office. 
^ o connell, joseph john. coin collector telephone toll lines, patent no. 704,268 (pdf). united states patent office. 
^ o connell, joseph john. cable terminal, patent no. 727, 829 (pdf). united states patent office. 
^ o connell, joseph john. telephone exchange system, patent no. 730,291 (pdf). united states patent office. 
^ o connell, joseph john. busy test apparatus telephone switchboards, patent no. 736,002 (pdf). united states patent office. 
^ o connell, joseph john. earth or ground wire attachment, patent no. 762,341, (pdf). united states patent office. 
^ o connell, joseph john. apparatus amplifying or reinforcing telephone currents, patent no, 760,143 (pdf). united states patent office. 






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