The 'client list` (literally meaning house list) (= regular customers, patrons, sponsors, backers and money lenders were also included in naming conventions.
「顧客リスト（ハウス・リスト）」（＝優良な顧客層。ご贔屓筋。スポンサー。スポンサー。タニマチ。借金の貸主）そのものも含む。