# Relationship history for MSHA mine 1511733

Current hierarchy: **Resources Organization Inc → Manchester Tipple Resources → No 1 Preparation Plant**

- 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

- **operator_operates_mine:** Bora Coal Corp → No 1 Preparation Plant; 1979-01-01 to 1981-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Hillier John Robert → No 1 Preparation Plant; 1979-01-01 to 1981-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Hillier John Robert → Bora Coal Corp; 1979-01-01 to 1981-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Manchester Tipple Resources → No 1 Preparation Plant; 1981-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Resources Organization Inc → No 1 Preparation Plant; 1981-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Resources Organization Inc → Manchester Tipple Resources; 1981-06-02 to current/open; source msha-controller-operator-history