القصة
ℹ️الوصف متوفر بالإنجليزية فقط
Demonstrates the differences between alternating current and direct current arc welding processes, and in particular the finer control available with AC machines at the time.
أفلام مشابهة
Hands On Drumming! Volume 1, Number 4
1996Hands On Drumming! Volume 1, Number 4
Day-to-Day Track Maintenance Part II: Switches & Crossings
1952






