Here is a link to the Hirobo Japan website.
This is a Japanese link. There is no English page.
Online translation may help some to understand the Japanese on the page.
http://babelfish.altavista.com/

After the Stream series, G. Naruke's Astral X are being produced in 50 class & 90 class.
It use to be either YS or OS for pattern engine, but not anymore. Saito joined to be a usable engine for pattern.
http://model2.hirobo.co.jp/top/04500.htm

IP