# Relationship history for MSHA mine 1800275

Current hierarchy: **A H  Smith Jr; Henry R  Smith → A H Smith Associates Limited Partnership → BRANCHVILLE**

- 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:** A H Smith → BRANCHVILLE; 1950-01-01 to 1988-11-22; source msha-controller-operator-history
- **controller_controls_mine:** A H  Smith → BRANCHVILLE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A H  Smith → A H Smith; 1950-01-01 to 1988-11-22; source msha-controller-operator-history
- **operator_operates_mine:** A H Smith Associates Limited Partnership → BRANCHVILLE; 1988-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** A H  Smith Jr et al → BRANCHVILLE; 1988-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A H  Smith Jr et al → A H Smith Associates Limited Partnership; 1988-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry R  Smith et al → A H Smith Associates Limited Partnership; 1988-11-23 to current/open; source msha-controller-operator-history