Kansas City’s Brown Button Estate Sales has launched a sister company to market and sell high-end items to national and international bidders. Circle Auction will handle fine art and sculpture, designer fashion, jewelry, exceptional antiques and modern design items. Auctions will reach users worldwide through LiveAuctioneers.com and Invaluable.com; Circle Auction also uses a proprietary bidding system through its app, which can be accessed at CircleAuction.co or through Apple and Android…