# Relationship history for MSHA mine 3303491

Current hierarchy: **Jennette Charles → Jennette Drilling Company → Sharpsburg 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:** Jennette Charles Et Al → Sharpsburg Strip; 1974-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jennette Drilling Company → Sharpsburg Strip; 1976-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jennette Charles Et Al → Jennette Drilling Company; 1976-04-26 to current/open; source msha-controller-operator-history