There are many more that occurred prior to Stanley Works (mostly hardware manufacture) buying Stanley Rule and Level (toolmakers) in 1920.
Stanley Rule and Level were ruthless when buying other companies either to manufacture their better tools or put them out of business.
In fact, Stanley Rule and Level arose from the merger of two businesses (Hall&Knapp and A.Stanley&Co.) in 1857. It was 1869 that marked the beginning of their rise to become America's largest toolmaker after buying Leonard Bailey's Boston plane making business.
Short Video of Stanley History
Innovation. Quality.