# Relationship history for MSHA mine 1513484

Current hierarchy: **B W  McDonald → Blazing Saddles Coal Corp → Mine #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

- **operator_operates_mine:** Chaffins Branch Mining Company Inc → Mine #1; 1982-05-01 to 1983-06-05; source msha-controller-operator-history
- **controller_controls_mine:** Hall Willis → Mine #1; 1982-05-01 to 1983-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Hall Willis → Chaffins Branch Mining Company Inc; 1982-05-01 to 1983-06-05; source msha-controller-operator-history
- **operator_operates_mine:** Blazing Saddles Coal Corp → Mine #1; 1983-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** B W  McDonald → Mine #1; 1983-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B W  McDonald → Blazing Saddles Coal Corp; 1983-06-06 to current/open; source msha-controller-operator-history