Concept of using alternative energy sources. Concepts & Topics Concepts Vitality Use of solar energy.
Info graphic. Safe use of ladders. Nine points. How to use a ladder. Guide and warnings Adult Incorrect Composition Info graphic. Safe use of ladders
Extraction processing and use of lubricants - vector illustration lubricator Vertical No People Extraction processing and use of lubricants
Environmental protection concept use of gasoline icon No People Air Pollution Biology Environmental protection concept use of gasoline icon
Environmental protection concept use of gasoline icon No People Air Pollution Biology Environmental protection concept use of gasoline icon
Environmental protection concept use of gasoline icon No People Air Pollution Biology Environmental protection concept use of gasoline icon
The innovation of the telephone revolutionized commerce and personal communication. This vintage engraving depicts the use of the new invention in business. So celebrated was this new technology that it was the subject of Victorian poetry, as these two panels were published in a collection of poetry in 1879. Engraved by an unknown artist, they are now in the public domain. Telephone Invention Candlestick Phone Early Use of the Telephone, circa 1879