# Relationship history for MSHA mine 4608070

Current hierarchy: **Keeney Timothy A → Level Land Mining Corp → Grindstone 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:** Munique Roland → Grindstone No 1; 1990-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Abaddon Mining Inc → Grindstone No 1; 1991-07-01 to 1993-01-03; source msha-controller-operator-history
- **controller_controls_operator:** Munique Roland → Abaddon Mining Inc; 1991-07-01 to 1993-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Keeney Timothy A → Grindstone No 1; 1992-06-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Level Land Mining Corp → Grindstone No 1; 1993-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keeney Timothy A → Level Land Mining Corp; 1993-01-04 to current/open; source msha-controller-operator-history