# Relationship history for MSHA mine 2200508

Current hierarchy: **Huey  Stockstill; Richard  Stockstill → S & S Gravel Inc → Smith Pit**

- 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:** J B Smith & Son Inc → Smith Pit; 1979-09-01 to 1980-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Smith J B → Smith Pit; 1979-09-01 to 1980-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Smith J B → J B Smith & Son Inc; 1979-09-01 to 1980-06-30; source msha-controller-operator-history
- **operator_operates_mine:** S & S Gravel Inc → Smith Pit; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Huey  Stockstill  et al → Smith Pit; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Huey  Stockstill  et al → S & S Gravel Inc; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Stockstill  et al → S & S Gravel Inc; 1980-07-01 to current/open; source msha-controller-operator-history