# Relationship history for MSHA mine 1101209

Current hierarchy: **Michael N  Cullinan; James P  Bruner → Rowe Construction Company-Div/R A Cullinan & Son → Holtz Pit #77**

- 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:** Michael N  Cullinan et al → Holtz Pit #77; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rickgauer Sand & Gravel → Holtz Pit #77; 1950-01-01 to 1980-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Rickgauer Sand & Gravel → Holtz Pit #77; 1950-01-01 to 1980-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Rickgauer Sand & Gravel → Rickgauer Sand & Gravel; 1950-01-01 to 1980-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Rowe Construction Company-Div/R A Cullinan & Son → Holtz Pit #77; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael N  Cullinan et al → Rowe Construction Company-Div/R A Cullinan & Son; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James P  Bruner et al → Rowe Construction Company-Div/R A Cullinan & Son; 1980-07-01 to current/open; source msha-controller-operator-history