# Relationship history for MSHA mine 3600148

Current hierarchy: **Estate of Beth Ann Smith White → Wissahickon Stone Quarry, LLC → Wissahickon Stone Quarry**

- 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:** Marcolina Brothers Inc → Wissahickon Stone Quarry; 1950-01-01 to 2003-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Marcolina Brothers Inc → Wissahickon Stone Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marcolina Brothers Inc → Marcolina Brothers Inc; 1950-01-01 to 2003-06-16; source msha-controller-operator-history
- **operator_operates_mine:** Chestnut Hill Stone Ltd → Wissahickon Stone Quarry; 2003-06-17 to 2008-09-07; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Lorenzon → Wissahickon Stone Quarry; 2003-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Lorenzon → Chestnut Hill Stone Ltd; 2003-06-17 to 2008-09-07; source msha-controller-operator-history
- **operator_operates_mine:** Wissahickon Stone Quarry, LLC → Wissahickon Stone Quarry; 2008-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John T  Smith et al → Wissahickon Stone Quarry; 2008-09-08 to 2022-10-19; source msha-controller-operator-history
- **controller_controls_operator:** John T  Smith et al → Wissahickon Stone Quarry, LLC; 2008-09-08 to 2022-10-19; source msha-controller-operator-history
- **controller_controls_operator:** Beth A  Smith White  et al → Wissahickon Stone Quarry, LLC; 2008-09-08 to 2022-10-19; source msha-controller-operator-history
- **controller_controls_mine:** Estate of Beth Ann Smith White → Wissahickon Stone Quarry; 2022-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Estate of Beth Ann Smith White → Wissahickon Stone Quarry, LLC; 2022-10-20 to current/open; source msha-controller-operator-history