Edison & the 19th Century:
Webnotes 1-1 to 1-9:
Step 1: Preconditions
Webnotes 2-1 to 2-4:
Step 2: Invention
Webnotes 3-1 to 3-2:
Step 3: Promotion
Webnotes 4-1 to 4-4:
Step 4: Competition
Webnotes 5-1 to 5-5:
Step 5: Consequences
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20th Century Inventors:
Webnotes 6-1 to 6-6:
Step 1: Preconditions
Webnotes 7-1 to 7-6:
Step 2: Invention
Webnotes 8-1 to 8-2:
Step 3: Promotion
Webnotes 9-1 to 9-2:
Step 4: Competition
Webnotes 10-1 to 10-2:
Step 5: Consequences
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