# Relationship history for MSHA mine 3608057

Current hierarchy: **Brentzel Cathy → Pittsburgh Mining Company Inc → Penn-Balt #3**

- 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:** Umbel Jeffrey M → Penn-Balt #3; 1988-07-01 to 1991-12-22; source msha-controller-operator-history
- **operator_operates_mine:** Upper Laurel Company → Penn-Balt #3; 1988-11-01 to 1989-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Tracy W  Hylton II → Penn-Balt #3; 1988-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tracy W  Hylton II → Upper Laurel Company; 1988-11-01 to 1989-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Joffre Coal & Construction Inc → Penn-Balt #3; 1989-11-14 to 1991-08-21; source msha-controller-operator-history
- **controller_controls_mine:** Brantner Melvin A → Penn-Balt #3; 1989-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brantner Melvin A → Joffre Coal & Construction Inc; 1989-11-14 to 1991-08-21; source msha-controller-operator-history
- **operator_operates_mine:** Penn Balt Inc → Penn-Balt #3; 1991-08-22 to 1991-12-22; source msha-controller-operator-history
- **controller_controls_operator:** Umbel Jeffrey M → Penn Balt Inc; 1991-08-22 to 1991-12-22; source msha-controller-operator-history
- **operator_operates_mine:** Pittsburgh Mining Company Inc → Penn-Balt #3; 1991-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brentzel Cathy → Penn-Balt #3; 1991-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brentzel Cathy → Pittsburgh Mining Company Inc; 1991-12-23 to current/open; source msha-controller-operator-history