# Relationship history for MSHA mine 4608075

Current hierarchy: **Town Of Shirley → Town Of Shirley → Highwall Miner #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Town Of Shirley → Highwall Miner #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → Highwall Miner #1; 1988-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Mining Inc → Highwall Miner #1; 1991-08-01 to 2001-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Appalachian Mining Inc; 1991-08-01 to 2001-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Town Of Shirley → Highwall Miner #1; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Town Of Shirley → Town Of Shirley; 2001-05-01 to current/open; source msha-controller-operator-history