How many movies have Billy Bitzer and Kate Bruce collaborated on?

They have worked on 12 movies together! Their first movie together was Judith of Bethulia (1914) while their highest rated movie together was Intolerance: Love's Struggle Throughout the Ages (1916). They have not worked together since The White Rose (1923). They are most known for their drama films together.

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John's Aunt
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Sister Geneviève (uncredited)
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Mother Bartlett
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Mrs. Blythe
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The Aunt
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Bettina's Aunt
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Mrs. Edward Grey
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Mrs. Logan
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Jeannette's Aunt
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The Mother of the Boy
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Old Babylonian Mother / The City Mother (uncredited)
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Judtih's Maid