# Relationship history for MSHA mine 3605539

Current hierarchy: **James  Filiaggi → Lawrence Coal Company → Bridgeville 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:** James  Filiaggi → Bridgeville Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bergad Coal Company → Bridgeville Strip; 1975-01-01 to 1976-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Bergad Coal Company → Bridgeville Strip; 1975-01-01 to 1976-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Bergad Coal Company → Bergad Coal Company; 1975-01-01 to 1976-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Vosco Inc → Bridgeville Strip; 1976-05-13 to 1979-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Schafer George → Bridgeville Strip; 1976-05-13 to 1979-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Schafer George → Vosco Inc; 1976-05-13 to 1979-06-03; source msha-controller-operator-history
- **operator_operates_mine:** Lawrence Coal Company → Bridgeville Strip; 1979-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Filiaggi → Lawrence Coal Company; 1979-06-04 to current/open; source msha-controller-operator-history