THIS IS INTERESTING!

[lawn mower fanatic]

This is an interesting mower thing......it has all these different attachments...from a mowing attachment to a plow attachment to a car pusher attachment! And it only has 2 wheels: Rapid Series
Also, here are some screenshots from their website:

 

[DaveTN]

That machine reminds me of the old BCS equipment. You could put a sickle bar mower, snow blower, rotary mower, and other attachments on it. It was blue as I recall. First time I saw one advertised was back in the mid 70's in an old Mother Earth News Magazine.

 

[reynoldston]

looks like the garden tractors back in the 40s and 50s. I don't think they wil ever take over the riders of today.

 

[Parkmower]

I see alot of the older versions for sale around here mostly out in the country. Pretty handy for someone who needs a variety of attachments. Most around here have a snow blade and mower deck.

I'm probably mistaken but I think this is how gravely started out. I seen some very old ones.