Rodan CD12 Rodan-Okaya CD12 tube CD13 The CD13 by Rodan-Okaya. A miniature top-view nixie tube. CD14 Rodan-Okaya CD14 top-view symbol tube CD24 A CD24 tube made by Rodan-Okaya. CD25 Rodan CD25 CD27 The CD27 is the largest top view nixie made by Rodan Okaya - at 54mm, the numerals are larger than the NL7037 and Z568. CD47 The CD47 (GR-414) is the largest tube in the world, with a digit height of 135mm. It was made by Rodan-Okaya of Japan. GR-1 The GR-1 is one of the first nixie tubes made by Rodan-Okaya (the other being the larger GR-2). You can see that the lettering on the tube is spelled Rodin, which is typical of the earlier tubes. This tube became the GR-201 and eventually the CD11. GR-2 Rodan-Okaya GR-2. Apparently an earlier version of the CD12. GR-201 Rodan Okaya GR-201 GR-211 A medium-sized tube manufactured by Rodan-Okaya GR-524 The GR-524 is an extremely rare symbol tube made by Rodan-Okaya. It shows the abbreviated days of the week in Kanji. GR-574 The GR-574 is an extremely rare nixie tube made by Rodan-Okaya of Japan. GR-707 The Rodan-Okaya GR-707. A small top-view nixie tube showing electrical symbols. Clearly intended for use in a multi-meter. This has the unusual feature of a side-nipple. The pin arrangement is also very unusual. GR-836 The Rodan-Okaya GR-836 is a large and extremely rare top-view 'nixie' tube. It has two Japanese symbols, which as far as I can tell mean 'power' and 'on'.