# Relationship history for MSHA mine 0505172

Current hierarchy: **CCI  (Clyde Companies Inc) → WW Clyde & Co. → Mill Iron 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

- **controller_controls_mine:** CCI  (Clyde Companies Inc) → Mill Iron Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CCI  (Clyde Companies Inc) → Mill Iron Pit; 2021-09-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** IHC Scott, Inc. → Mill Iron Pit; 2023-06-06 to 2023-09-30; source msha-controller-operator-history
- **controller_controls_operator:** CCI  (Clyde Companies Inc) → IHC Scott, Inc.; 2023-06-06 to 2023-09-30; source msha-controller-operator-history
- **operator_operates_mine:** WW Clyde & Co. → Mill Iron Pit; 2023-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CCI  (Clyde Companies Inc) → WW Clyde & Co.; 2023-10-01 to current/open; source msha-controller-operator-history