# Relationship history for MSHA mine 4503212

Current hierarchy: **Dave  Lapp → Hard Rock Mining Co Of Olympia Inc → HARDROCK 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:** Hard Rock Crushing Inc → HARDROCK PIT; 1989-10-01 to 1993-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Marshall D  Williams → HARDROCK PIT; 1989-10-01 to 1993-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Marshall D  Williams → Hard Rock Crushing Inc; 1989-10-01 to 1993-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Hard Rock Mining Co Of Olympia Inc → HARDROCK PIT; 1993-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dave  Lapp → HARDROCK PIT; 1993-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Lapp → Hard Rock Mining Co Of Olympia Inc; 1993-07-15 to current/open; source msha-controller-operator-history