# Relationship history for MSHA mine 1511253

Current hierarchy: **Howard Jasper B → Magnum Mining Corp → No 3 Strip**

- 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:** Howard Jasper B → No 3 Strip; 1976-06-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Magnum Mining Corp → No 3 Strip; 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howard Jasper B → Magnum Mining Corp; 1978-05-01 to current/open; source msha-controller-operator-history