# Relationship history for MSHA mine 2402137

Current hierarchy: **Justin T  Sherman; Jon T  Sherman → Lasalle Sand & Gravel Corp. → LA SALLE S&G**

- 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:** La Salle Sand & Gravel LLP → LA SALLE S&G; 1998-03-01 to 2013-11-04; source msha-controller-operator-history
- **controller_controls_mine:** Justin T  Sherman et al → LA SALLE S&G; 1998-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justin T  Sherman et al → La Salle Sand & Gravel LLP; 1998-03-01 to 2013-11-04; source msha-controller-operator-history
- **controller_controls_operator:** Jon T  Sherman et al → La Salle Sand & Gravel LLP; 1998-03-01 to 2013-11-04; source msha-controller-operator-history
- **operator_operates_mine:** Lasalle Sand & Gravel Corp. → LA SALLE S&G; 2013-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jon T  Sherman et al → LA SALLE S&G; 2013-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jon T  Sherman et al → Lasalle Sand & Gravel Corp.; 2013-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justin T  Sherman et al → Lasalle Sand & Gravel Corp.; 2013-11-05 to current/open; source msha-controller-operator-history