# Relationship history for MSHA mine 1512545

Current hierarchy: **Gary A  Endicott → Mountain Dredging, Inc. → No 1 Dredge**

- 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:** Mountain Dredging Inc → No 1 Dredge; 1980-09-01 to 1983-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Daniels W J → No 1 Dredge; 1980-09-01 to 1983-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Daniels W J → Mountain Dredging Inc; 1980-09-01 to 1983-01-17; source msha-controller-operator-history
- **operator_operates_mine:** Canora Coal Corp → No 1 Dredge; 1983-01-18 to 1984-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Ternan Mel → No 1 Dredge; 1983-01-18 to 1984-01-11; source msha-controller-operator-history
- **controller_controls_operator:** Ternan Mel → Canora Coal Corp; 1983-01-18 to 1984-01-11; source msha-controller-operator-history
- **operator_operates_mine:** Tutor Key Dredging Company → No 1 Dredge; 1984-01-12 to 2001-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Butcher Daniel R-Ted Daniels Et Al → No 1 Dredge; 1984-01-12 to 2001-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Butcher Daniel R-Ted Daniels Et Al → Tutor Key Dredging Company; 1984-01-12 to 2001-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Dredging, Inc. → No 1 Dredge; 2001-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary A  Endicott → No 1 Dredge; 2001-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary A  Endicott → Mountain Dredging, Inc.; 2001-02-16 to current/open; source msha-controller-operator-history