Poimintoja puhelin- ja lennätintoiminnan historiasta.
Contributors: PTL-Tele (Firm)
Publisher: PTL Tele
Published: 1987
Place of publication: [Helsinki]
Language: fin
Subjects: Finland. Posti- ja telelaitos -- History.; Telephone -- Finland -- History.; Telegraph -- Finland -- History.
Notes: Includes bibliographical references.
Vol. 2 has subtitle: Jatko-osa 1989.