# Relationship history for MSHA mine 3607432

Current hierarchy: **King Debra → Technical Mining Inc → Eva-Jane 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

- **operator_operates_mine:** Masontown Coal Company Inc → Eva-Jane Tipple; 1983-02-01 to 1983-09-19; source msha-controller-operator-history
- **controller_controls_mine:** Mahaffey Steven T → Eva-Jane Tipple; 1983-02-01 to 1983-09-19; source msha-controller-operator-history
- **controller_controls_operator:** Mahaffey Steven T → Masontown Coal Company Inc; 1983-02-01 to 1983-09-19; source msha-controller-operator-history
- **operator_operates_mine:** Technical Mining Inc → Eva-Jane Tipple; 1983-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** King Debra → Eva-Jane Tipple; 1983-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** King Debra → Technical Mining Inc; 1983-09-20 to current/open; source msha-controller-operator-history