Regarding the duplicative coverage: several of Elite Hall Publishing’s Journals contain interesting fillers for their first few volumes, although the early “volumes” only appear to contain 1-3 articles maximum.
For instance:
International Journal of Advanced Engineering and Science
Vol. 1, No. 1, 2012- Quantity Improvement with Continuous Quality Inspection Production Line
Vol. 1, No. 2, 2012- Quality improvement in a car seat production line
Journal of Mechanical and Industrial Engineering Research
Vol. 1, No. 1, 2012- Quality improvement in a car seat production line
Vol. 1, No. 2, 2012- Quantity Improvement with Continuous Quality Inspection Production Line
The two articles were written/recycled by Jia-Chi Tsou of China University of Technology in Taiwan, an editor. The first article, Quality improvement in a car seat production line, was also published in the T&F journal: Production Planning & Control: The Management of Operations, Volume 16, Issue 7, 2005, under the title: Case Study: Quality improvement in a car seat production line. The matching article in Elite Hall’s Journals is printed without the abstract, but the latter portions of the article are identical.
http://www.tandfonline.com/doi/abs/10.1080/09537280500249223#.Vs0qjLQzDzI (paywall)
http://ijaes.elitehall.com/Vol1No2.pdf
Similarly, the second article (also sans abstract): Quantity Improvement with Continuous Quality Inspection Production Line, was published in Foundations of Computing and Decision Sciences in 2004 under the title: Economic production quantity model with continuous quality inspection.
https://www.researchgate.net/profile/Jen-Ming_Chen/publication/265315595_Economic_production_quantity_model_with_continuous_quality_inspection/links/540f14aa0cf2f2b29a3dd0fb.pdf
http://ijaes.elitehall.com/Vol1No1.pdf
The WhoIs email for the site is jtsou12@gmail.com, similar to Jia Chi Tsou’s email: jtsou.tw@yahoo.com.tw. I wonder if he was the person who registered the journal, especially since the first volume of the journals noted above provide an address for Elite Hall Publishing House that is located in Taiwan. That email is also associated with the site snuffbottle.info. When you visit the site and click on the ‘about this site’ page, you are given a short bio on Jia Chi Tsou:
http://snuffbottle.info/snuffbottle/Englishframe.htm
Additionally, Jia Chi Tsou was one of the original people to list a call for papers back in 2013:
https://www.h-net.org/announce/show.cgi?ID=207652