# Relationship history for MSHA mine 1510115

Current hierarchy: **Basic American Industries → Dig Mining Company Inc → No 1 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Stumbo Brothers & Pulse Company Inc → No 1 Surface; 1976-11-01 to 1977-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Stumbo Ray → No 1 Surface; 1976-11-01 to 1977-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Stumbo Ray → Stumbo Brothers & Pulse Company Inc; 1976-11-01 to 1977-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Dig Mining Company Inc → No 1 Surface; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Basic American Industries → No 1 Surface; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Basic American Industries → Dig Mining Company Inc; 1977-11-01 to current/open; source msha-controller-operator-history