The slide shown is from McCracken's Removable Partial Prosthodontics - this is clearly cited at the bottom of the projected slide.

The classification of Types of Minor Connectors (as shown) is from McCracken's Removable Partial Prosthodontics, a classic textbook authored originally by William L. McCracken, and later continued by Alan B. Carr, David T. Brown, and others in subsequent editions.

The four types of minor connectors listed on the slide are:

So to directly answer your question: McCracken (McCracken's Removable Partial Prosthodontics) gave this classification of minor connectors.