Top View Tubes Top-view tubes 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. GI-10 National Union GI-10 Inditron. Widely accepted to be the first mass-produced 'nixie'. GI-21 National Union GI-21 Inditron GN-4P This version of the GN-4 has a red-coating and a decimal point on the left and was manufactured by Lorenz SEL. GN5 ITT GN5. A medium-sized top-view Nixie tube 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-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'.