Obviousness

I cannot perform a detailed obviousness analysis under 35 U.S.C. § 103 by combining specific prior art references because the provided "Prior art section" only lists "Prior art keywords" (stroller, seat, attachment, wheel support, support portion) and a "Prior art date" (2008-12-04), but does not enumerate specific prior art patent documents or publications.

A proper obviousness analysis requires identifying specific primary and secondary references that predate the patent's effective filing date (which, based on priority claims, is related to December 4, 2008) and then articulating a motivation for a person having ordinary skill in the art (PHOSITA) to combine the teachings of these specific references. Without these concrete prior art documents, I cannot identify combinations or explain the motivation to combine them.

The "Background" section of the patent does describe existing problems with prior strollers, such as permanently affixed double seats, larger dimensions of double strollers, and issues with detachable covers for existing attachment mechanisms. While this description gives context to the problem the invention aims to solve, it does not provide the specific details of prior art inventions needed for a § 103 analysis.

Therefore, I am unable to fulfill the request to identify combinations of prior art references and explain the motivation to combine them, as the necessary specific prior art documents are not provided in the authoritative text.