# Relationship history for MSHA mine 1103183

Current hierarchy: **Brian R  Buehne → Carlyle Sand & Gravel-A LTD → Carlyle Sand & Gravel-A LTD**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Carlyle Sand & Gravel LTD → Carlyle Sand & Gravel-A LTD; 2007-09-11 to 2007-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Robert J  Buehne → Carlyle Sand & Gravel-A LTD; 2007-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert J  Buehne → Carlyle Sand & Gravel LTD; 2007-09-11 to 2007-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Carlyle Sand & Gravel-A LTD → Carlyle Sand & Gravel-A LTD; 2007-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert J  Buehne → Carlyle Sand & Gravel-A LTD; 2007-11-01 to 2020-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Robert J  Buehne → Carlyle Sand & Gravel-A LTD; 2007-11-01 to 2020-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Brian R  Buehne → Carlyle Sand & Gravel-A LTD; 2020-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian R  Buehne → Carlyle Sand & Gravel-A LTD; 2020-05-19 to current/open; source msha-controller-operator-history