# Relationship history for MSHA mine 1512301

Current hierarchy: **Stopher Thomas → T B & J Construction → No 2 Surface**

- 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

- **operator_operates_mine:** T B & J Construction → No 2 Surface; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stopher Thomas Et Al → No 2 Surface; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stopher Thomas Et Al → T B & J Construction; 1980-04-01 to current/open; source msha-controller-operator-history