# Relationship history for MSHA mine 4404096

Current hierarchy: **Hall Terry → Sandstone Mining Inc Of Va → No 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Sow Branch Coal Company → No 1; 1975-08-01 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_mine:** May Ollie & Britt Jackson → No 1; 1975-08-01 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_operator:** May Ollie & Britt Jackson → Sow Branch Coal Company; 1975-08-01 to 1979-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Sandstone Mining Inc Of Va → No 1; 1979-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hall Terry → No 1; 1979-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Terry → Sandstone Mining Inc Of Va; 1979-02-01 to current/open; source msha-controller-operator-history