# Relationship history for MSHA mine 0301636

Current hierarchy: **Bowers Paul → Bowers Stone Company → HARDY SAND & GRAVEL PLT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Gotte Sand & Gravel Company → HARDY SAND & GRAVEL PLT; 1988-03-01 to 1993-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Gotte Lester → HARDY SAND & GRAVEL PLT; 1988-03-01 to 1993-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Gotte Lester → Gotte Sand & Gravel Company; 1988-03-01 to 1993-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Bowers Stone Company → HARDY SAND & GRAVEL PLT; 1993-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bowers Paul → HARDY SAND & GRAVEL PLT; 1993-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bowers Paul → Bowers Stone Company; 1993-09-22 to current/open; source msha-controller-operator-history