# Relationship history for MSHA mine 4503074

Current hierarchy: **Eben  Twaddle → Interwest Construction, Inc. → Old Smokey 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:** Hillcar & Fletcher Inc → Old Smokey Pit; 1986-04-01 to 2023-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Jack  Hillcar → Old Smokey Pit; 1986-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Hillcar → Hillcar & Fletcher Inc; 1986-04-01 to 2023-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Eben  Twaddle → Old Smokey Pit; 2016-01-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Interwest Construction, Inc. → Old Smokey Pit; 2023-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eben  Twaddle → Interwest Construction, Inc.; 2023-06-05 to current/open; source msha-controller-operator-history