This is a lot more common than most suspect. In my own trade (photo gear) there are a few large "assemblers- manufacturers" and a few key component manufacturers(lens block,sensor,main circuit board,screen ) . So when you open up say a Pentax and a Nikon compact you will find many common components and in fact they could be assembled in the same plant. (say Sanyo…) Pretty much the same as when you open a PC.
The peculiar part is that OEM (Original Equipment Manufacturer) has somehow changed from defining the factory that puts the item together to describing the re-seller.
Strange also how perceived rivals collaborate with each other, yet divisions (appropriately named) within the same group compete with each other (Sony,Samsung,Matsush-ta are good examples) .
Here is an example : the first Video 8 camcorder (invented by Kodak but associated with Sony) was made by Matsush-ta (Panasonic) the ones that sold VHS-C…
Franco
BTW, most tents also are made for not by the brand we know…
Matsush ita is a "possible profanity…"
Back on topic
Some comments here :
http://www.rei.com/product/408031
Also here http://en.wikipedia.org/wiki/Silva_compass
for the Silva/Brunton/Fiskars connection.
Sometime ago I found a longer discussion about that in one of the forums , so maybe google some keywords if you need to know more.
Franco