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Great Inventions.Final X

Across
Originally used silver compounds to create.
Abbreviation for concrete
Karl Benz first patented this in 1886.
First used by monks and scholars.
Every car used to have one.
Made many people stars.
Often sent via Morse code
Company famous for its refrigerators
Made from charcoal, sulfur and saltpeter.
Replaced clay tablets.
Type of engine
Printing _______ .
Down
A desktop is a version of this.
Early forms of this relied on cut ice.
Made the world wide web possible.
A magnifying glass is a simple version of this.
Developed to break wartime encryption.
Optical instruments.
A type of cleaner
Cogwheel