# Relationship history for MSHA mine 0101746

Current hierarchy: **Reading & Bates Corp → R B Coal Company → Gum Springs Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Reading & Bates Corp → Gum Springs Pit; 1975-12-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R B Coal Company → Gum Springs Pit; 1977-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reading & Bates Corp → R B Coal Company; 1977-06-01 to current/open; source msha-controller-operator-history