# Relationship history for MSHA mine 3609544

Current hierarchy: **Mark  Popple; David  Popple → Popple Construction → Dolph Colliery Mine Fire**

- 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:** Popple Construction → Dolph Colliery Mine Fire; 2007-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Popple et al → Dolph Colliery Mine Fire; 2007-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Popple et al → Popple Construction; 2007-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Popple et al → Popple Construction; 2007-07-30 to current/open; source msha-controller-operator-history