[Answer] 7. This type of engineer designs, develops, and tests aircraft, spacecraft, and missiles and supervises the manufacture of these products.

Step 1 : Introduction to the question "7. This type of engineer designs, develops, and tests aircraft, spacecraft, and missiles and supervises the manufacture of these products."

...1. Civil Engineer 2. Safety Engineer 3. Mechanical Engineer 4. Aerospace Engineer Aerospace engineers develop new technologies for use in aviation, defense systems, and space exploration, often specializing in areas such as structural design, guidance, navigation and control, instrumentation and communication, or production methods.

[Ans] Who received a patent for the manufacture of chewing gum in December 1869?

Step 1 : Introduction to the question "Who received a patent for the manufacture of chewing gum in December 1869?"

Although marketed in 1848 by John Curtis, it was William Finely Semple who first patented chewing gum for production in 1869. In 1892, William Wrigley began his Wrigley chewing gum company and produced flavors such as Juicy Fruit and Doublemint. 

Step 2 : Answer to the question "Who received a patent for the manufacture of chewing gum in December 1869?"

William Finely Semple:

Chewing gum is natural and/or artificial latex, with natural and artificial flavors added. A boon for those desiring to satisfy their oral fixations without eating or smoking, chewing gum became popular immediately when first available. Although marketed in 1848 by John Curtis, it was William.

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