# Relationship history for MSHA mine 0101448

Current hierarchy: **Renfroe R Bogan → Renfroe Grading Inc → Acmar Pit 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:** Renfroe R Bogan → Acmar Pit No 1; 1975-06-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rosa Mineral Company → Acmar Pit No 1; 1975-10-01 to 1975-11-05; source msha-controller-operator-history
- **controller_controls_mine:** Rosa Mineral Company → Acmar Pit No 1; 1975-10-01 to 1975-11-05; source msha-controller-operator-history
- **controller_controls_operator:** Rosa Mineral Company → Rosa Mineral Company; 1975-10-01 to 1975-11-05; source msha-controller-operator-history
- **operator_operates_mine:** Renfroe Grading Inc → Acmar Pit No 1; 1975-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Renfroe R Bogan → Renfroe Grading Inc; 1975-11-06 to current/open; source msha-controller-operator-history