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As the modification made in the existing parking system as disclosed in prior art document D5, we have to see the technical advancement over existing vertical rotary parking system.

From the above comparison table, it is evident that in both the documents, there are four pull groove to transmit the power to suspension chains. The construction of pull gear and suspension chain is also similar. Both the parking system transmits the power from drive motor 200 to pull gear 50,155 by externally meshed ring and pinion gear. The difference can be seen while comparing the document D5 and the present invention, is in the male and female portion (as assumed in the drawing comparison table) mounted on both suspensions chain and pull gear or ring gear.