# Relationship history for MSHA mine 4402763

Current hierarchy: **Mrs William H  Bowen → Limestone Dust Corp → Limestone Dust Mill**

- 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:** Big Blue Coal Company → Limestone Dust Mill; 1950-01-01 to 1973-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Belcher Berchie → Limestone Dust Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Belcher Berchie → Big Blue Coal Company; 1950-01-01 to 1973-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Mrs William H  Bowen → Limestone Dust Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Limestone Dust Corp → Limestone Dust Mill; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mrs William H  Bowen → Limestone Dust Corp; 1974-01-01 to current/open; source msha-controller-operator-history