# Relationship history for MSHA mine 1516600

Current hierarchy: **Chester Adams → Duke Coal Inc → #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

- **controller_controls_mine:** Riley Ronald Et Al → #1; 1987-03-01 to 1990-05-23; source msha-controller-operator-history
- **controller_controls_mine:** Elliott Gary Et Al → #1; 1988-11-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Elijah Coal Company → #1; 1989-03-01 to 1990-05-23; source msha-controller-operator-history
- **controller_controls_operator:** Riley Ronald Et Al → Elijah Coal Company; 1989-03-01 to 1990-05-23; source msha-controller-operator-history
- **controller_controls_mine:** Warfield Gary & Jerry → #1; 1989-05-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** G & M Coal Company → #1; 1990-05-24 to 1990-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Warfield Gary & Jerry → G & M Coal Company; 1990-05-24 to 1990-07-01; source msha-controller-operator-history
- **operator_operates_mine:** Amy Coal Company → #1; 1990-07-02 to 1992-10-19; source msha-controller-operator-history
- **controller_controls_operator:** Elliott Gary Et Al → Amy Coal Company; 1990-07-02 to 1992-10-19; source msha-controller-operator-history
- **operator_operates_mine:** Patterson Equipment → #1; 1992-10-20 to 1993-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Patterson Dan → #1; 1992-10-20 to 1993-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Patterson Dan → Patterson Equipment; 1992-10-20 to 1993-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Poor Man Coal Company → #1; 1993-02-01 to 1993-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Jones Hugh Jr Et Al → #1; 1993-02-01 to 1993-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Jones Hugh Jr Et Al → Poor Man Coal Company; 1993-02-01 to 1993-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Duke Coal Inc → #1; 1993-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chester Adams → #1; 1993-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chester Adams → Duke Coal Inc; 1993-04-21 to current/open; source msha-controller-operator-history