Bell Telephone Laboratories Invented the ________, Which Replaced the Vacuum

question 2

Short Answer

Bell Telephone Laboratories invented the ________, which replaced the vacuum tube.

---

Definitions:

Commercial Infrastructure

The foundational physical and organizational structures needed for the operation of a market and its services.

Legal Systems

The comprehensive set of laws and regulations, including the institutions and processes through which they are enforced and interpreted, governing a specific territory or country.

Banking Systems

Systems comprising institutions and protocols that enable financial transactions, savings, and investments across individuals and businesses.

Quota

A fixed, limited amount or number of something, such as goods or people.