# Relationship history for MSHA mine 3608433

Current hierarchy: **Mark  Houser; Garry W  Houser → Walter L Houser Coal Company Inc → Allen Mine**

- 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:** Mark  Houser et al → Allen Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Walter L Houser Coal Company Inc → Allen Mine; 1993-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Houser et al → Walter L Houser Coal Company Inc; 1993-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Garry W  Houser et al → Walter L Houser Coal Company Inc; 1993-10-01 to current/open; source msha-controller-operator-history