# Relationship history for MSHA mine 1516043

Current hierarchy: **Smith Raymond → Diamond S Mining Company → Mine #1**

- 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:** Smith Harold G → Mine #1; 1983-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** N & S Coal Inc → Mine #1; 1987-05-01 to 1987-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Smith Harold G → N & S Coal Inc; 1987-05-01 to 1987-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Diamond S Mining Company → Mine #1; 1987-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Raymond → Mine #1; 1987-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Raymond → Diamond S Mining Company; 1987-08-05 to current/open; source msha-controller-operator-history