Can't identify maker

From: Maxine
Email: yayaredmax@yahoo.com


Have baby calculator light color metal face plate, dk brown plastic? case says ADD SUBTRACT MULTIPLY DIVIDE on front. At bottom front Glenview Illinois - USA Trade mark reg US Pat. OFF Skinny pullout metal carrying handle on top. Came with 3 fold instruction leaflet, all inside reddish-brown snap closure carrying case fake leather. Can anyone help?