# Relationship history for MSHA mine 3606131

Current hierarchy: **Justin  Safford → Safford Sand and Gravel INC. → Lowville Pit 1**

- 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:** Maybro Asphalt Company → Lowville Pit 1; 1950-01-01 to 1985-06-24; source msha-controller-operator-history
- **controller_controls_mine:** R P  Schreckengost → Lowville Pit 1; 1950-01-01 to 1994-09-26; source msha-controller-operator-history
- **controller_controls_operator:** R P  Schreckengost → Maybro Asphalt Company; 1950-01-01 to 1985-06-24; source msha-controller-operator-history
- **operator_operates_mine:** Wroblewski Sand & Gravel Inc → Lowville Pit 1; 1985-06-25 to 2016-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Wroblewski → Lowville Pit 1; 1985-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Wroblewski → Wroblewski Sand & Gravel Inc; 1985-06-25 to 2016-05-15; source msha-controller-operator-history
- **operator_operates_mine:** Safford Sand and Gravel INC. → Lowville Pit 1; 2016-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Justin  Safford → Lowville Pit 1; 2016-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justin  Safford → Safford Sand and Gravel INC.; 2016-05-16 to current/open; source msha-controller-operator-history