# Relationship history for MSHA mine 4104785

Current hierarchy: **Michael  Hollingshead → SRM Materials LLC → SRM Materials South Channing 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Scott  Venable → SRM Materials South Channing Pit; 2007-07-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Venable's Construction → SRM Materials South Channing Pit; 2009-04-29 to 2010-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Venable → Venable's Construction; 2009-04-29 to 2010-04-25; source msha-controller-operator-history
- **operator_operates_mine:** XIT Sand & Gravel, LLC → SRM Materials South Channing Pit; 2010-04-26 to 2024-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Wally  Johnson → SRM Materials South Channing Pit; 2010-04-26 to 2018-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Wally  Johnson → XIT Sand & Gravel, LLC; 2010-04-26 to 2018-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Hollingshead et al → SRM Materials South Channing Pit; 2013-12-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → SRM Materials South Channing Pit; 2018-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → XIT Sand & Gravel, LLC; 2018-07-16 to 2024-04-07; source msha-controller-operator-history
- **operator_operates_mine:** SRM Materials LLC → SRM Materials South Channing Pit; 2024-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Hollingshead et al → SRM Materials LLC; 2024-04-08 to current/open; source msha-controller-operator-history