Marker

Marker When were markers invented
When were markers invented
How long have markers been around? The history of permanent markers dates back to 1910. At that time, Lee W. Newman patented the first marking pen. Th...
Marker Which symbol on a regulatory marker is used to warn of a rock or other underwater hazard?
Which symbol on a regulatory marker is used to warn of a rock or other underwater hazard?
Which symbol on a regulatory marker is used to market swimming area? Which symbol on a regulatory marker is used to mark a swimming area? Orange cross...
Marker Regulatory marker indicates dam or stumps?
Regulatory marker indicates dam or stumps?
What does a regulatory marker indicate? Regulatory markers are used to advise you of situations, dangers, or directions. They may indicate shoals, swi...