# Relationship history for MSHA mine 4603433

Current hierarchy: **G B  Frederick → Silver Shadow Mining & Management → No 1 & 2 Auger**

- 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:** Allen Coal Company → No 1 & 2 Auger; 1950-01-01 to 1975-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Estep Jess → No 1 & 2 Auger; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Estep Jess → Allen Coal Company; 1950-01-01 to 1975-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Silver Shadow Mining & Management → No 1 & 2 Auger; 1975-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** G B  Frederick → No 1 & 2 Auger; 1975-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** G B  Frederick → Silver Shadow Mining & Management; 1975-06-05 to current/open; source msha-controller-operator-history