# Relationship history for MSHA mine 1512986

Current hierarchy: **Gary A  Endicott → M & E Coal 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:** L & R Dredging → No 1 Dredge; 1981-07-01 to 1995-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Emory T  Frazier → No 1 Dredge; 1981-07-01 to 1995-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Emory T  Frazier → L & R Dredging; 1981-07-01 to 1995-03-05; source msha-controller-operator-history
- **operator_operates_mine:** M & E Coal Inc → No 1 Dredge; 1995-03-06 to 2001-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Paul K  Maynard → No 1 Dredge; 1995-03-06 to 2001-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Paul K  Maynard → M & E Coal Inc; 1995-03-06 to 2001-02-15; source msha-controller-operator-history
- **operator_operates_mine:** M & E Coal 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 → M & E Coal Inc; 2001-02-16 to current/open; source msha-controller-operator-history