# Relationship history for MSHA mine 0700094

Current hierarchy: **Richard E  Pierson Jr; Michael K  Pierson → Diamond Materials, LLC → Diamond Materials, 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:** Stayton'S Sand & Gravel Inc → Diamond Materials, LLC; 1950-01-01 to 1994-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Thomas R  Stayton → Diamond Materials, LLC; 1950-01-01 to 1994-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Thomas R  Stayton → Stayton'S Sand & Gravel Inc; 1950-01-01 to 1994-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Miller Brothers Sand & Gravel Inc → Diamond Materials, LLC; 1994-08-11 to 2011-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Duane  Miller → Diamond Materials, LLC; 1994-08-11 to 2007-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Duane  Miller → Miller Brothers Sand & Gravel Inc; 1994-08-11 to 2007-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Ed  Thwaites → Diamond Materials, LLC; 2007-05-01 to 2008-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Ed  Thwaites → Miller Brothers Sand & Gravel Inc; 2007-05-01 to 2008-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Miller → Diamond Materials, LLC; 2008-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Miller → Miller Brothers Sand & Gravel Inc; 2008-01-18 to 2011-03-08; source msha-controller-operator-history
- **operator_operates_mine:** Diamond Materials, LLC → Diamond Materials, LLC; 2011-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael K  Pierson et al → Diamond Materials, LLC; 2011-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael K  Pierson et al → Diamond Materials, LLC; 2011-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Pierson Jr et al → Diamond Materials, LLC; 2011-03-09 to current/open; source msha-controller-operator-history