# Relationship history for MSHA mine 2901858

Current hierarchy: **Bruce W  Hale → J R Hale Contracting Company Inc → Project #Hes 000 S(19)**

- 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

- **controller_controls_mine:** Bruce W  Hale  et al → Project #Hes 000 S(19); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J R Hale Contracting Company Inc → Project #Hes 000 S(19); 1981-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce W  Hale  et al → J R Hale Contracting Company Inc; 1981-04-01 to current/open; source msha-controller-operator-history