# Relationship history for MSHA mine 1512791

Current hierarchy: **Prather Robert J → Christina Resources Inc → Mine #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

- **operator_operates_mine:** R S F Coal Reserves Inc → Mine #1; 1981-03-01 to 1990-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Rhein Thomas J → Mine #1; 1981-03-01 to 1990-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Rhein Thomas J → R S F Coal Reserves Inc; 1981-03-01 to 1990-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Christina Resources Inc → Mine #1; 1990-06-27 to 1991-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Prather Robert J → Mine #1; 1990-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Prather Robert J → Christina Resources Inc; 1990-06-27 to 1991-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Bam Coal Inc → Mine #1; 1991-05-14 to 1992-09-29; source msha-controller-operator-history
- **controller_controls_mine:** Sheffer Martin D → Mine #1; 1991-05-14 to 1992-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Sheffer Martin D → Bam Coal Inc; 1991-05-14 to 1992-09-29; source msha-controller-operator-history
- **operator_operates_mine:** Christina Resources Inc → Mine #1; 1992-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Prather Robert J → Christina Resources Inc; 1992-09-30 to current/open; source msha-controller-operator-history