# Relationship history for MSHA mine 3401099

Current hierarchy: **Brent W  Quisenberry → Rock Island Stone Company LLC → #1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** T D M Quarry → #1 Quarry; 1978-03-09 to 1992-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Dennis  Mason → #1 Quarry; 1978-03-09 to 1992-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Mason → T D M Quarry; 1978-03-09 to 1992-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Brent  Quisenberry et al → #1 Quarry; 1986-01-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rock Island Stone Company Inc → #1 Quarry; 1992-04-20 to 2018-07-26; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Quisenberry et al → Rock Island Stone Company Inc; 1992-04-20 to 2018-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Rock Island Stone Company LLC → #1 Quarry; 2018-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brent W  Quisenberry → #1 Quarry; 2018-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent W  Quisenberry → Rock Island Stone Company LLC; 2018-07-27 to current/open; source msha-controller-operator-history