# Relationship history for MSHA mine 3002405

Current hierarchy: **Karen  Lietz → K & D Gravel Products Company → OLMSTEAD 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:** Henning Brothers Contractors Inc → OLMSTEAD PIT; 1979-01-01 to 1985-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Henning David E → OLMSTEAD PIT; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henning David E → Henning Brothers Contractors Inc; 1979-01-01 to 1985-04-23; source msha-controller-operator-history
- **operator_operates_mine:** K & D Gravel Products Company → OLMSTEAD PIT; 1985-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Karen  Lietz → OLMSTEAD PIT; 1985-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Karen  Lietz → K & D Gravel Products Company; 1985-04-24 to current/open; source msha-controller-operator-history