# Relationship history for MSHA mine 3607175

Current hierarchy: **Donald C  Bender; Rick  Bender → B & B Anthracite Coal Company → Rock Ridge Slope**

- 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:** Con Dor Coal Company → Rock Ridge Slope; 1981-07-01 to 1982-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Harner Leonard & Jackson Et Al → Rock Ridge Slope; 1981-07-01 to 1982-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Harner Leonard & Jackson Et Al → Con Dor Coal Company; 1981-07-01 to 1982-06-03; source msha-controller-operator-history
- **operator_operates_mine:** J & L Coal Company → Rock Ridge Slope; 1982-06-04 to 1983-03-10; source msha-controller-operator-history
- **controller_controls_mine:** Lesher Robert & John Johnson → Rock Ridge Slope; 1982-06-04 to 1983-03-10; source msha-controller-operator-history
- **controller_controls_operator:** Lesher Robert & John Johnson → J & L Coal Company; 1982-06-04 to 1983-03-10; source msha-controller-operator-history
- **operator_operates_mine:** B & B Anthracite Coal Company → Rock Ridge Slope; 1983-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rick  Bender et al → Rock Ridge Slope; 1983-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Bender et al → B & B Anthracite Coal Company; 1983-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald C  Bender et al → B & B Anthracite Coal Company; 1983-03-11 to current/open; source msha-controller-operator-history