# Relationship history for MSHA mine 1517542

Current hierarchy: **Tim  McDonald → Ho-Jo Coal Inc → Mine No 3**

- 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:** B W  McDonald → Mine No 3; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Marine Coal Corp → Mine No 3; 1994-05-01 to 1995-07-28; source msha-controller-operator-history
- **controller_controls_operator:** B W  McDonald → Marine Coal Corp; 1994-05-01 to 1995-07-28; source msha-controller-operator-history
- **controller_controls_mine:** Tim  McDonald → Mine No 3; 1995-05-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ho-Jo Coal Inc → Mine No 3; 1995-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  McDonald → Ho-Jo Coal Inc; 1995-07-29 to current/open; source msha-controller-operator-history