# Relationship history for MSHA mine 1518427

Current hierarchy: **Anthony K  Dotson; Mark  Dotson → A & M Coal Co., Inc. → No. 2**

- 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:** Mark  Dotson et al → No. 2; 1988-02-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A & M Coal Co., Inc. → No. 2; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Dotson et al → A & M Coal Co., Inc.; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anthony K  Dotson et al → A & M Coal Co., Inc.; 2001-08-01 to current/open; source msha-controller-operator-history