# Relationship history for MSHA mine 4503234

Current hierarchy: **William  Arness → Hard Rock Inc → Hard Rock Gardiner 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:** Bayview Excavating → Hard Rock Gardiner Pit; 1991-03-01 to 1993-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Vig Robert W → Hard Rock Gardiner Pit; 1991-03-01 to 1993-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Vig Robert W → Bayview Excavating; 1991-03-01 to 1993-10-15; source msha-controller-operator-history
- **operator_operates_mine:** J & D Trucking Inc → Hard Rock Gardiner Pit; 1993-10-16 to 2001-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Schneider → Hard Rock Gardiner Pit; 1993-10-16 to 2001-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Schneider → J & D Trucking Inc; 1993-10-16 to 2001-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Hard Rock Inc → Hard Rock Gardiner Pit; 2001-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Arness → Hard Rock Gardiner Pit; 2001-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Arness → Hard Rock Inc; 2001-07-12 to current/open; source msha-controller-operator-history