It is not possible to say. The first clay ovens used by the ancients possibly.
harry connick Jr. did a son about a church and barbq stand- I have been trying to find it myself!
You can find pictures of a range cooker by browsing the sites listed in the "Related Links" section of this answer.
There are many websites out there where you can find slow cooker recipes. I don't have a favourite website in particular. You may be able to find one on allrecipies.com
You can find West Bend slow cooker manuals on the manufacturer's website or by contacting their customer service for assistance.
One can find a recipe for beef stew in the cookbook that one received when the slow cooker was purchased. The Martha Stewart website also has a recipe for slow cooker beef stew.
Go to search and put in pressure cooker. You will come up various pictures of one.
http://www.redhillgeneralstore.com/pdf/mirromanual.pdf
The Big Green Egg is a premium quality smoker, grill and an oven, too! The Original American Designed Ceramic Cooker. Based on an ancient clay cooker called a "kamado". Who does want to buy egg barbecue grill?
The website http://allrecipes.com//Recipes/everyday-cooking/pressure-cooker/Main.aspx has some great recipes available. They are easy to make and very simple when using the pressure cooker.
Just about every recipe website on the web will have slow cooker recipes. Some good recipe websites to check out are allrecipes.com and cookinglight.com. You will find well over 100 slow cooker recipes between those two sites alone.
Spare parts for a Cannon cooker can be found from stores and suppliers such as Target and Partsmaster. Other examples of these websites include Buy Spares, and Cooker-Parts.