It’s very simple: everyone knows that ,when you climb a stair, the major difficulty is in turning the landing stair and not to climb them.
For example: to turn on the landing stair you must always consider the diagonal of the object added to the wheels,then assuming an object to 60x60cm. + 30cm. For Wheels we have a diagonal of 108cm. As long as the system with 6 joints MARIO PATENTED we pass the wheels under the load and we get an exact size of 60x60cm. So only the size of the object therefore a diagonal of 87CM. With this system you have the ability to pass on all the narrow stairs. You don’t believe?
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We will be happy to show you that WE GET WHERE OTHERS CAN’T.