# Relationship history for MSHA mine 1515612

Current hierarchy: **Endicott Shelby R → Ro-Ann Mining Inc → #2**

- 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

- **operator_operates_mine:** R I B Coal Company Inc → #2; 1986-05-01 to 1986-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Ratliff Ira-Bill Et Al → #2; 1986-05-01 to 1986-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Ira-Bill Et Al → R I B Coal Company Inc; 1986-05-01 to 1986-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Cole-Jack Coal Company Inc → #2; 1986-10-07 to 1987-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Jackson Barry → #2; 1986-10-07 to 1987-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Jackson Barry → Cole-Jack Coal Company Inc; 1986-10-07 to 1987-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Endicott Shelby R → #2; 1987-01-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ro-Ann Mining Inc → #2; 1987-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Endicott Shelby R → Ro-Ann Mining Inc; 1987-06-04 to current/open; source msha-controller-operator-history