# Relationship history for MSHA mine 3300017

Current hierarchy: **Brent  Gerken; Michael J  Gerken → Bluffton Stone Company → Bluffton Stone Company LLC.**

- 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:** Bluffton Stone Company → Bluffton Stone Company LLC.; 1950-01-01 to 1989-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Maurice  Fett → Bluffton Stone Company LLC.; 1950-01-01 to 1989-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Maurice  Fett → Bluffton Stone Company; 1950-01-01 to 1989-07-10; source msha-controller-operator-history
- **operator_operates_mine:** Bluffton Stone Company → Bluffton Stone Company LLC.; 1989-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael J  Gerken et al → Bluffton Stone Company LLC.; 1989-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael J  Gerken et al → Bluffton Stone Company; 1989-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Gerken et al → Bluffton Stone Company; 1989-07-11 to current/open; source msha-controller-operator-history