Thank you for the translation! Salaryman life sure seems risky, Shima stumbles across mobsters almost everywhere he goes. There is one thing, I can't remember if it's been explained in an earlier volume: I know that Hatsushiba is Matsushita and Solar is Sony, but what about Tôritsu? Is it Toshiba, or what?
There's like a whole bunch of these and occasionally there's another company mentioned that's only in like one panel as where some guy is from. But these are the big ones (I think some of these haven't shown up yet):
ソラー電機 Solar Electric (Based on Sony)
電報堂 Denpōdō (Based on Hakuhōdō)
東立 Tōritsu (Based on Tōshiba)
日芝 Hishiba (Based on Hitachi)
PG (Based on LG)
博通エージェンシイ Hakutsū Agency (Based on Dentsū)
五洋電機 Goyō Electric (Based on Sanyō Electric)
豊産自動車 Hōsan Automotive (Based on Nissan)
五洋 Goyō (Company under Hatsushiba Holdings)
四菱重工 Yotsubishi Heavy Industries (Based on Mitsubishi)
Somsam which is "Samsung" wiht the syllables reversed which hasn't shown up yet.
There's also a number of companies which are Mitsubishi but with the "mitsu" (meaning 3) switched out for some other number and in this volume there's a 六星電器 Yuksung Electronics which is sorta like Samsung but with "six" instead of "three" like Samsung (which means three-star).