Harmon had an instructional booklet published in 1970 that featured ads for his line of products (most of Harmon's business ventures ultimately failed, and sadly he suffered great financial problems by the late 1980s):



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The booklet also featured an introduction by Al Kaline:



Here's a photo of Harmon's batting trainer (which came in a few different versions/boxes):



Not advertised in the booklet was the Snappet. This is a (unique?) promo for the Snappet toy that I bought from the Killebrew estate: