# Relationship history for MSHA mine 0504446

Current hierarchy: **JLL Partners Incorporated → Pioneer Sand Company → Florence Gravel Pit**

- 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

- **controller_controls_mine:** Gary  Schnurr → Florence Gravel Pit; 1950-01-01 to 2014-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Sand Company → Florence Gravel Pit; 1990-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Schnurr → Pioneer Sand Company; 1990-09-01 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** JLL Partners Incorporated → Florence Gravel Pit; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** JLL Partners Incorporated → Pioneer Sand Company; 2015-01-01 to current/open; source msha-controller-operator-history