# Relationship history for MSHA mine 2200173

Current hierarchy: **Thomas R  Boydstun → Boydstun Lumber Co → Jackson Pit**

- 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:** Lou Con Inc → Jackson Pit; 1950-01-01 to 1979-10-29; source msha-controller-operator-history
- **controller_controls_mine:** Garry V  Hughes → Jackson Pit; 1950-01-01 to 1979-10-29; source msha-controller-operator-history
- **controller_controls_operator:** Garry V  Hughes → Lou Con Inc; 1950-01-01 to 1979-10-29; source msha-controller-operator-history
- **operator_operates_mine:** Boydstun Lumber Co → Jackson Pit; 1979-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas R  Boydstun → Jackson Pit; 1979-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas R  Boydstun → Boydstun Lumber Co; 1979-10-30 to current/open; source msha-controller-operator-history