Ball and Roller Bearing Unit No. 72
October 1946

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This unit includes:

• a rough-ground steel ball
• a polished steel ball
• a single row ball bearing
• a double row ball bearing
• a finished roller
• a tapered roller bearing (shown disassembled above its card, and assembled to the right of its card; only one bearing of this type is included in this unit)
• a needle bearing
• a set of descriptive museum-style cards, shown in the photo next to the samples they describe.
• eight pages of notes containing 7 experiments

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