Vtg Stromberg-Carlson Telephone Wiring Diagrams S-C 500D / 554B and 501D / 556B

Vintage Stromberg-Carlson Telephone Wiring Diagrams S-C 500D / 554B and 501D / 556B Two connected pages of telephone wiring diagrams (NOTE: no telephone(s) included; listing is for diagrams only) Left page is titled: Stromberg-Carlson Corporation S-C 500D / 554B Telephone Wiring Diagram Right page is titled: Stromberg-Carlson Corporation S-C 501D / 556B Telephone Wiring Diagram I do not see a date, but research indicates they likely date to the 1960s and/or 1970s Paper has tanning, pen mark on its back, folds, and some rips but overall is fairly well preserved for its decades and decades old age. [Please note it is vintage, not a brand new document]. [May be shipped folded in half along its original fold line & will be shipped very carefully to protect it.] {Pretty purple, green, & ivory backdrop in photo(s) not included} ~ Comes from clean, smoke free environment. ~ Happy to answer any questions. Thank you for looking.