, ▁steel ▁whe els ▁for ▁street c ars . ▁In ▁ 1 8 6 9 , ▁at ▁age ▁ 2 0 , ▁his ▁younger ▁brother ▁Benjamin ▁went ▁to ▁work ▁in ▁their ▁father ' s ▁saw mill ▁in ▁New ▁Ham pshire ▁along ▁with ▁William ▁Harrison ▁Hol t ▁and ▁Am es ▁Frank ▁Hol t , ▁prepar ing ▁hard wood s ▁for ▁sh ipping ▁to ▁Charles ▁in ▁San ▁Francisco . ▁William ▁and ▁Am es ▁joined ▁Charles ▁in ▁San ▁Francisco ▁in ▁ 1 8 7 1 . ▁ ▁In ▁the ▁same ▁year , ▁Charles ▁and ▁Am es ▁established ▁the ▁Hol t ▁Brothers ▁Company ▁in ▁San ▁Francisco . ▁The ▁company ▁sold ▁hard wood , ▁l umber , ▁and ▁w agon ▁and ▁carriage ▁materials , ▁primarily ▁manufact uring ▁w agon ▁ax les , ▁whe els , ▁and ▁frames . ▁W .   H arrison ▁Hol t ▁and ▁Am es ▁both ▁tempor arily ▁returned ▁around ▁ 1 8 7 1 ▁to ▁New ▁Ham pshire ▁– ▁where ▁both ▁were ▁married ▁– ▁to ▁manage ▁the ▁eastern ▁business . ▁The ▁brothers ▁built ▁a ▁factory ▁in ▁Con cord , ▁New ▁Ham pshire , ▁to ▁manufact ure ▁w agon ▁whe els , ▁wheel ▁components , ▁bodies ▁and ▁running ▁g ear . ▁In ▁ 1 8 7 2 , ▁at ▁age ▁ 2 3 , ▁Benjamin ▁was ▁given ▁an ▁interest ▁in ▁his ▁father ' s ▁business , ▁and ▁he ▁assumed ▁more ▁responsibility ▁for ▁the ▁company ' s ▁operations . ▁W .   H arrison ▁Hol t ▁moved ▁to ▁T iff in , ▁Ohio , ▁to ▁manage