Missing particle after など in article about new technologies to monitor employees


I'm reading this
[article](https://www3.nhk.or.jp/news/easy/k10011528251000/k10011528251000.html)
about new technologies that are getting introduced to monitor employees.

I am unsure about the following sentence. I do not understand why there isn't
a particle or something like it between the など and the 230. Is this a typo or
what is intended here?

> ソフトウェアをつくっている会社 **など２３０** の会社が新しい技術を紹介しています
>
> My Translation: 230 companies are introducing new technologies, where these
> companies and similar places are producing software




In [_Nominal apposition in
Japanese_](https://www.questia.com/library/journal/1G1-132534929/nominal-
apposition-in-japanese) (2004), Rumiko Sode calls this など an "exemplifier",
and considers this construction a type of apposition in which one noun phrase
restates a subset of another.

Basically, you've got two noun phrases next to each other:

> N1などN2

Which expresses that N1 is included within N2. In other words, N1 is a
restatement of _part of_ N2. It could be translated in various ways depending
on context. For example:

> 秋田犬など大型犬に最近人気がある。  
>  Recently, Akitas and other large-breed dogs are becoming popular.

Here, 大型犬 includes 秋田犬 as a subset or an example, and the noun phrases are
linked together by など. Nothing is missing between them.

Likewise, in your example:

> ソフトウェアをつくっている会社など２３０の会社が新しい技術を紹介しています。

The larger set is ２３０の会社, and ソフトウェアをつくっている会社 is some subset of those 230
companies.




In [_Nominal apposition in
Japanese_](https://www.questia.com/library/journal/1G1-132534929/nominal-
apposition-in-japanese) (2004), Rumiko Sode calls this など an "exemplifier",
and considers this construction a type of apposition in which one noun phrase
restates a subset of another.

Basically, you've got two noun phrases next to each other:

> N1などN2

Which expresses that N1 is included within N2. In other words, N1 is a
restatement of _part of_ N2. It could be translated in various ways depending
on context. For example:

> 秋田犬など大型犬に最近人気がある。  
>  Recently, Akitas and other large-breed dogs are becoming popular.

Here, 大型犬 includes 秋田犬 as a subset or an example, and the noun phrases are
linked together by など. Nothing is missing between them.

Likewise, in your example:

> ソフトウェアをつくっている会社など２３０の会社が新しい技術を紹介しています。

The larger set is ２３０の会社, and ソフトウェアをつくっている会社 is some subset of those 230
companies.

