# Relationship history for MSHA mine 0900265

Current hierarchy: **Michael  Hollingshead → SRM Materials, LLC → Junction City Sand**

- 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:** Brown Brothers Sand Company → Junction City Sand; 1950-01-01 to 2017-10-16; source msha-controller-operator-history
- **controller_controls_mine:** Brown Brothers Sand Company → Junction City Sand; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown Brothers Sand Company → Brown Brothers Sand Company; 1950-01-01 to 2017-10-16; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Hollingshead et al → Junction City Sand; 2013-12-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brown Brothers Sand LLC → Junction City Sand; 2017-10-17 to 2022-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Ely Corporation → Junction City Sand; 2017-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ely Corporation → Brown Brothers Sand LLC; 2017-10-17 to 2022-11-30; source msha-controller-operator-history
- **operator_operates_mine:** SRM Materials, LLC → Junction City Sand; 2022-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Hollingshead et al → SRM Materials, LLC; 2022-12-01 to current/open; source msha-controller-operator-history