K.K. Sumimitsu (㈱住光) was a Japanese camera distributor. It advertised the Sister Six and Crystar 25 by Crystar Kōki in February 1954. In May of the same year, it was offering the Crystar 15 folder and the Crystar 25 TLR by Crystar Kōki, the Crystar 45 TLR by Ōshiro Seisakusho, and the Sisley 55 folder by Takane. The model numbers 15, 25, 45 and 55 were perhaps grafted by Sumimitsu itself: the Crystar 15 was another name for the Crystar Six and the Sisley 55 was the Sisley 1.
The address given in the advertisements is Tōkyō-to Chūō-ku Kyōbashi (東京都中央区京橋) 3–11.
- Asahi Camera (アサヒカメラ) editorial staff. Shōwa 10–40nen kōkoku ni miru kokusan kamera no rekishi (昭和10–40年広告にみる国産カメラの歴史, Japanese camera history as seen in advertisements, 1935–1965). Tokyo: Asahi Shinbunsha, 1994. ISBN 4-02-330312-7.
- Hagiya Takeshi (萩谷剛). "Mine Shikkusu: Gunma-ken Takasaki-shi no kameramēkā" (ミネシックス：群馬県高崎市のカメラメーカー, Mine Six: A camera-maker in Takasaki, Gunma). Chapter 7 of Zunō kamera tanjō: Sengo kokusan kamera jū monogatari (ズノーカメラ誕生：戦後国産カメラ10物語, The birth of the Zunow camera: Ten stories of postwar Japanese camera makers). Tokyo: Asahi Sonorama, 1999. ISBN 4-257-12023-1. First published as an article in Kurashikku Kamera Senka no.27.