# Relationship history for MSHA mine 4606351

Current hierarchy: **Hartman H H → H C M Coal Company Inc → Tipple 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Sparkle Enterprise Inc → Tipple No 1; 1981-07-01 to 1983-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Hallemann A J → Tipple No 1; 1981-07-01 to 1983-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Hallemann A J → Sparkle Enterprise Inc; 1981-07-01 to 1983-12-01; source msha-controller-operator-history
- **operator_operates_mine:** H C M Coal Company Inc → Tipple No 1; 1983-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hartman H H → Tipple No 1; 1983-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hartman H H → H C M Coal Company Inc; 1983-12-02 to current/open; source msha-controller-operator-history