# Relationship history for MSHA mine 1511477

Current hierarchy: **Garrett Charles → Janeco Coal Company Inc → M-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:** Brock Ramsey → M-1; 1978-02-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Janeco Coal Company Inc → M-1; 1978-08-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Brock Ramsey → Janeco Coal Company Inc; 1978-08-01 to 1980-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Janeco Coal Company Inc → M-1; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Garrett Charles → M-1; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Garrett Charles → Janeco Coal Company Inc; 1980-04-01 to current/open; source msha-controller-operator-history