# Relationship history for MSHA mine 0504935

Current hierarchy: **Matthew  Sprague → Carter Lake Enterprises → Meadow Hollow 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

- **controller_controls_mine:** Matthew  Sprague  et al → Meadow Hollow Quarry; 1985-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Colorado Sandstone Quarries LLC → Meadow Hollow Quarry; 2009-06-01 to 2013-01-14; source msha-controller-operator-history
- **controller_controls_mine:** John E Holliday → Meadow Hollow Quarry; 2009-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John E Holliday → Colorado Sandstone Quarries LLC; 2009-06-01 to 2013-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Carter Lake Enterprises → Meadow Hollow Quarry; 2013-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew  Sprague  et al → Carter Lake Enterprises; 2013-01-15 to current/open; source msha-controller-operator-history