# Relationship history for MSHA mine 3606190

Current hierarchy: **Jolly Jessie J → North Cambria Fuel Company Inc → Driscoll Hollow Strip Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Bearer Martin L → Driscoll Hollow Strip Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North Cambria Fuel Company → Driscoll Hollow Strip Mine; 1976-08-12 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Bearer Martin L → North Cambria Fuel Company; 1976-08-12 to 1978-11-30; source msha-controller-operator-history
- **operator_operates_mine:** North Cambria Fuel Company Inc → Driscoll Hollow Strip Mine; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jolly Jessie J → Driscoll Hollow Strip Mine; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jolly Jessie J → North Cambria Fuel Company Inc; 1978-12-01 to current/open; source msha-controller-operator-history