The file name of these photos includes an abbreviated description of the type of agitation and the machine ID number of the washer. I am still revising the names of these agitation systems and inventing new ones. Sometimes the intention of the inventor is not evident. It is one of the main sources of enjoyment in collecting washing machines to find a machine with a different agitation system from the ones you already have. There seem to be an endless number of agitation concepts that must have resulted from an equal number of sleepless nights.
Invention is a curious and marvelous attribute of human kind.