# Relationship history for MSHA mine 3607814

Current hierarchy: **Kenneth  Morchesky → Laurel Land Development Inc → Mcdermott**

- 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

- **controller_controls_mine:** Todd  Morchesky → Mcdermott; 1982-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Land Development Inc → Mcdermott; 1986-07-01 to 1990-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Todd  Morchesky → Laurel Land Development Inc; 1986-07-01 to 1990-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth  Morchesky → Mcdermott; 1989-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Land Development Inc → Mcdermott; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Morchesky → Laurel Land Development Inc; 1990-11-01 to current/open; source msha-controller-operator-history