# Relationship history for MSHA mine 4604713

Current hierarchy: **Nippon Kokan K K → National Mines Corp → No 2 Tipple**

- 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:** Nippon Kokan K K et al → No 2 Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K & P Coal Company → No 2 Tipple; 1975-08-01 to 1977-07-01; source msha-controller-operator-history
- **controller_controls_mine:** John C  Geupel → No 2 Tipple; 1975-08-01 to 1977-07-01; source msha-controller-operator-history
- **controller_controls_operator:** John C  Geupel → K & P Coal Company; 1975-08-01 to 1977-07-01; source msha-controller-operator-history
- **operator_operates_mine:** National Mines Corp → No 2 Tipple; 1977-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nippon Kokan K K et al → National Mines Corp; 1977-07-02 to current/open; source msha-controller-operator-history