ለመመዝገብ ከዚያ 1 ደቂቃ ያነሰ ጊዜ ይወስዳል ከዚያም ያልተገደበ ፊልሞችን እና የቴሌቪዥን ርዕሶችን መደሰት ይችላሉ ፡፡
The Step by Step Switch 1951 ነፃ ያልተገደበ መዳረሻ
This AT&T informational film describes in detail how step-by-step switches work, and demonstrates their real-time operation by calling a 5-digit phone number from another dial telephone.
የስራ ጊዜ: 8 ደቂቃዎች
ጥራት: HD
መልቀቅ: Jul 03, 1951
ሀገር: United States of America
ቋንቋ:
ቁልፍ ቃል :
