If you are curious about the "cross" or rope and pulley symbol found on some branded brick, it is the mark of the Common Brick Manufacturers Association (CBMA).

If members dues were paid up, they were allowed to use the mark.
Fred Rieck told me there was an instance, where a once upon a time CBMA member (a manufacturer) who was not up-to-date on dues had to chisel the symbol out of his molds, leaving a patchy rectangle molded into the brick where the symbol had been. 

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