# Relationship history for MSHA mine 4604344

Current hierarchy: **Thecker Duncan & Lewis Ellison → Campbell Mining Company → Logan #1**

- 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:** C R P Excavating & Hauling Company → Logan #1; 1974-06-07 to 1975-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Copley Ira → Logan #1; 1974-06-07 to 1975-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Copley Ira → C R P Excavating & Hauling Company; 1974-06-07 to 1975-02-01; source msha-controller-operator-history
- **operator_operates_mine:** High Spur Coal Company → Logan #1; 1975-02-02 to 1978-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Hartman H H → Logan #1; 1975-02-02 to 1978-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Hartman H H → High Spur Coal Company; 1975-02-02 to 1978-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Thecker Duncan & Lewis Ellison → Logan #1; 1975-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Evergreen Industries Inc → Logan #1; 1977-08-18 to 1979-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Excel Development Inc → Logan #1; 1978-03-01 to 1979-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Evergreen Industries Inc → Excel Development Inc; 1978-03-01 to 1979-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Pittston Company → Logan #1; 1979-06-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Excel Development Inc → Logan #1; 1979-11-01 to 1981-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Excel Development Inc; 1979-11-01 to 1981-08-09; source msha-controller-operator-history
- **operator_operates_mine:** Campbell Mining Company → Logan #1; 1981-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thecker Duncan & Lewis Ellison → Campbell Mining Company; 1981-08-10 to current/open; source msha-controller-operator-history