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US3502280A
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Retractor device with shiftable brake
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US3480227A
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Retractor device with compensating brake
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US3332638A
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Retractor device with brake
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US2450078A
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Resilient sash bearing
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US2304175A
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Adjustable spring sash balance
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US2304176A
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Spring sash balance
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US2256205A
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Glider hook for sash balances
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US2242650A
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Spring sash balance
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CA481028A
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Spring sash balance
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CA477239A
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Spring sash balances
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CA481027A
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Adjustable spring sash balance
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CA473437A
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Friction shoes for window sashes
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CA475147A
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Glider hooks for sash balances
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