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What inventions had been made by the end of the 19-20th century?

1. ……………..… had been invented by the end of the 19th century.

2. ……………...…. had been pioneered by the end of the 19th century.

3. ……………..…. had been patented by the end of the 20th century.

4. ……………..….. had been produced by the end of the 19th century.

5. ……………..….. had been designed by the end of the 20th century.

6. ………………… had been tested by the end of the 20th century.

invented made built found designed tested created
discovered perfected pioneered produced patented

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