AT&T Bell System Plant Series Reference
Telephone sets
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Also See for Bell System Plant Series:
- Alignment instructions (42 pages) ,
- Test instructions (26 pages) ,
- Installation and maintenance manual (25 pages)
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BELL SYSTEM
PRACTICES
Plant Series
REFERENCE
SECTION 502-501-102
Issue
1,
February
1970
AT
&
TCo Standard
502-, 510-, 511-,
515-,
555-,
AND 558-TYPE TELEPHONE SETS
EXCLUSION
HOLO
KEY
LINE
ANO
SIGNAL KEY
502
TYPE)
511 OR 515
LINE
ANO
SIGNAL
KEY
510
555 OR 558
Fig. 1- 502-, 510-, 511-, 515-, 555-,
and 558-Type Telephone Sets
·"'
.\
mt•rit-an
Tl•lt'phunl' and 1\•lt•graph Cum
pan~·.
Hl71l
l'ranlt'd
in
l'.S ..
\
.
LINE
ANO
SIGNAL KEY
Page 1
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