# Relationship history for MSHA mine 1516386

Current hierarchy: **Frazier Robert B → Beaver Mining Inc → No 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:** Kretzer Peggy A → No 1; 1987-10-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ampak Mining Inc → No 1; 1988-05-01 to 1988-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Kretzer Peggy A → Ampak Mining Inc; 1988-05-01 to 1988-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Ashley Mining Company → No 1; 1988-10-25 to 1989-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Ratliff Jim-Frank Reffitt Et Al → No 1; 1988-10-25 to 1989-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Jim-Frank Reffitt Et Al → Ashley Mining Company; 1988-10-25 to 1989-01-09; source msha-controller-operator-history
- **operator_operates_mine:** Mentor Mining Inc → No 1; 1989-01-10 to 1989-10-26; source msha-controller-operator-history
- **controller_controls_mine:** Preece Kelly → No 1; 1989-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Preece Kelly → Mentor Mining Inc; 1989-01-10 to 1989-10-26; source msha-controller-operator-history
- **controller_controls_mine:** Frazier Robert B → No 1; 1989-10-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Beaver Mining Inc → No 1; 1989-10-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frazier Robert B → Beaver Mining Inc; 1989-10-27 to current/open; source msha-controller-operator-history