# Relationship history for MSHA mine 3606792

Current hierarchy: **Woods Robert & Anthony J Pivirotto → King Coal Company → King No 9**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Woods Robert & Anthony J Pivirotto → King No 9; 1976-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** King Coal Company → King No 9; 1979-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Woods Robert & Anthony J Pivirotto → King Coal Company; 1979-02-01 to current/open; source msha-controller-operator-history