500 Series Wall Telephones, 554 A and B

500 Series Wall Telephones, 558 A and B, 2-line pickup
and signaling

500 Series Wall Telephones, 558 C and D, 2-line pickup, signaling, exclusion and control leads

500 Series Wall Telephones, 558 F, 2-line pickup, exclusion on line 1, signaling and speakerphone

500 Series Wall Telephones, 558 F, 1-line pickup, hold and secretarial service

500 Series Wall Telephones, 558 F, 1-line pickup and cutoff extension or extension line ringer

500 Series Wall Telephones, 558 A and B - Table A

500 Series Wall Telephones, 558 C and D - Table B

500 Series Wall Telephones, 558 C and D - Table C

500 Series Wall Telephones, 558 F, 1-line pickup, hold and secretarial service - Table D

500 Series Wall Telephones, 558 F, 1-line pickup and cutoff extension or extension line ringer - Table E