# Relationship history for MSHA mine 2800017

Current hierarchy: **Turco Jerry → Pondview Townhouse Inc → Pondview Town Houses Incorporated**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** M L Kernan Quarry Company → Pondview Town Houses Incorporated; 1950-01-01 to 1979-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Kernan Louis E → Pondview Town Houses Incorporated; 1950-01-01 to 1979-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Kernan Louis E → M L Kernan Quarry Company; 1950-01-01 to 1979-11-07; source msha-controller-operator-history
- **operator_operates_mine:** Pondview Townhouse Inc → Pondview Town Houses Incorporated; 1979-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Turco Jerry → Pondview Town Houses Incorporated; 1979-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Turco Jerry → Pondview Townhouse Inc; 1979-11-08 to current/open; source msha-controller-operator-history