# Relationship history for MSHA mine 3604713

Current hierarchy: **Patrick A  Stassi → Teem Environmental Services Inc → Bel Air Colliery**

- 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 Brothers Coal Company → Bel Air Colliery; 1950-01-01 to 2008-08-28; source msha-controller-operator-history
- **controller_controls_mine:** James  Popple et al → Bel Air Colliery; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Popple et al → Popple Brothers Coal Company; 1950-01-01 to 2008-08-28; source msha-controller-operator-history
- **controller_controls_operator:** Victoria  Popple et al → Popple Brothers Coal Company; 1950-01-01 to 2008-08-28; source msha-controller-operator-history
- **operator_operates_mine:** Teem Environmental Services Inc → Bel Air Colliery; 2008-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Patrick A  Stassi → Bel Air Colliery; 2008-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick A  Stassi → Teem Environmental Services Inc; 2008-08-29 to current/open; source msha-controller-operator-history