The mod dolls that clone themselves

Edico had Missy Mod dolls in the late 1960s and early 1970s.

https://www.worthpoint.com/worthopedia/vintage-missy-mod-fashion-doll-1497742719

Edico also had Mini Mod dolls and clothes in the late 1960s and early 1970s.

https://www.ebay.com/itm/124941800749

Shillman had Mini Mod dolls and clothes.  These were later in the 1970s and 1980s, so I am assuming that Shillman bought out Edico.

https://www.worthpoint.com/worthopedia/shillman-mini-mod-fashion-doll-219687290

Shillman had Maxi Mod dolls and clothes in the late 1960s and early 1970s.

https://www.worthpoint.com/worthopedia/maxi-mod-shillman-box-428038098

A&H Doll Manufacturing had Marcie Mod in the late 1960s.

https://in.pinterest.com/pin/567172146821039308/

Maddie Mod was made by Princess Grace in the late 1960s, Mego in the early and mid-1970s and Summit Industries in the late 1970s.

https://www.worthpoint.com/worthopedia/maddie-mod-doll-princess-grace-pink-1823362593

https://www.flickr.com/photos/smh223837/5173010673

https://www.flickr.com/photos/topocri/5862536545

I don't know who made Betsy Teen but these are the early 1970s Maddie Mod clothing boxes, but the clothes are different.

https://www.worthpoint.com/worthopedia/vintage-betsy-teen-barbie-clone-doll-1798952731

The dozens of accessories for these dolls were always the same.  No one has ever researched this, but I am assuming all these companies used the same manufacturing plant.