# Relationship history for MSHA mine 3402170

Current hierarchy: **Rick D  Bumpers → Stigler Stone Company, Inc. → RD#1**

- 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:** Rick D  Bumpers → RD#1; 1987-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Qualls et al → RD#1; 2005-07-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Solid Rock Stone, INC → RD#1; 2017-06-01 to 2021-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Qualls et al → Solid Rock Stone, INC; 2017-06-01 to 2021-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Qualls et al → Solid Rock Stone, INC; 2017-06-01 to 2021-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Stigler Stone Company, Inc. → RD#1; 2021-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick D  Bumpers → Stigler Stone Company, Inc.; 2021-07-01 to current/open; source msha-controller-operator-history