The Siren Board

Ever since reading this article on the official ARS Wiki I've been intrigued by this obscure manufacturer. Take a look: https://wiki.airraidsirens.net/Alert_Systems,_Inc.
Now my question is, where did this info come from? Internet searches yield no results, there aren't any photos, and I'm curious as to where this came from. Does anyone have more info on this short-lived DOA company?

The link takes you to an empty page, but it can be found here: https://wiki.airraidsirens.net/index.ph ... ems%2C+Inc

I'm guessing that because the project failed and this was back in the 1970s, there wouldn't have been much info about it online. It's got no links to any sources either, so I have no clue where whoever wrote that got their information from.

I wrote that article YEARS ago, back in 2015. I thought I had cited it back then, but maybe not.

I still had a bookmarked list of sources I used to make the article, here they are:
https://news.google.com/newspapers?nid= ... 2538&hl=en
https://news.google.com/newspapers?nid= ... 2741&hl=en
https://news.google.com/newspapers?nid= ... 7234&hl=en
https://news.google.com/newspapers?nid= ... 5121&hl=en
https://news.google.com/newspapers?nid= ... 1161&hl=en
https://news.google.com/newspapers?nid= ... 9210&hl=en
https://news.google.com/newspapers?nid= ... 8958&hl=en
https://news.google.com/newspapers?nid= ... 7722&hl=en
https://news.google.com/newspapers?nid= ... 1735&hl=en
https://news.google.com/newspapers?nid= ... 9509&hl=en
https://news.google.com/newspapers?nid= ... 3060&hl=en
https://news.google.com/newspapers?nid= ... 1121&hl=en
https://news.google.com/newspapers?nid= ... 2994&hl=en
https://news.google.com/newspapers?nid= ... 7250&hl=en
https://news.google.com/newspapers?nid= ... 6127&hl=en
https://news.google.com/newspapers?nid= ... 5615&hl=en
https://news.google.com/newspapers?nid= ... 0867&hl=en
https://news.google.com/newspapers?nid= ... 8465&hl=en
https://news.google.com/newspapers?nid= ... 9859&hl=en
https://news.google.com/newspapers?nid= ... 8125&hl=en
https://news.google.com/newspapers?nid= ... 5337&hl=en
https://news.google.com/newspapers?nid= ... 6646&hl=en
https://news.google.com/newspapers?nid= ... 3080&hl=en
https://news.google.com/newspapers?nid= ... 9985&hl=en
https://news.google.com/newspapers?nid= ... 2327&hl=en
https://news.google.com/newspapers?nid= ... 8340&hl=en
https://news.google.com/newspapers?nid= ... 8849&hl=en
https://news.google.com/newspapers?nid= ... 1500&hl=en
https://news.google.com/newspapers?nid= ... 4293&hl=en

If I get a chance, I'll actually add these citations to the wiki.