# Relationship history for MSHA mine 2001972

Current hierarchy: **Joel  Garett → South Hill Sand & Gravel Inc → PIONEER**

- 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:** Bit-Con Corp-Plant #6 → PIONEER; 1950-01-01 to 1986-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Harold  Hardy Jr → PIONEER; 1950-01-01 to 1986-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Hardy Jr → Bit-Con Corp-Plant #6; 1950-01-01 to 1986-06-22; source msha-controller-operator-history
- **operator_operates_mine:** South Hill Sand & Gravel Inc → PIONEER; 1986-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joel  Garett → PIONEER; 1986-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joel  Garett → South Hill Sand & Gravel Inc; 1986-06-23 to current/open; source msha-controller-operator-history