# Relationship history for MSHA mine 3608887

Current hierarchy: **James  Hornyak → West Ridge Gravel Company → WEST RIDGE GRAVEL CO. PIT AND MI**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** West Ridge Gravel Company → WEST RIDGE GRAVEL CO. PIT AND MI; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James  Hornyak → WEST RIDGE GRAVEL CO. PIT AND MI; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Hornyak → West Ridge Gravel Company; 2000-11-01 to current/open; source msha-controller-operator-history