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- Ernest S. Sutton
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- Marcus Frieder
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- Melville Eastham
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- Michael Ehret
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- Philadelphia & Reading Railroad Company.
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- Richard C. du Pont
- rifles
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- Robert Beiswenger
- rocket fuel
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- Rogers
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- Samuel Warren
- sand
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- Sixteenth century
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- sole leather
- soluable silicates
- Space vehicles
- Sperry Rand Corporation
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- stamped sheet-metal
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- synchronous rectifier
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- Taylor Iron & Steel Company
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- The Broomells
- Thomas Hoopes
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- Union Iron Works
- United States Envelope Company
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- US Navy contracts
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- Victor Talking Machine Company
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- Westinghouse Electric & Manufacturing Company
- wheel maker
- Wheeler & Wilson Manufacturing Company
- wheels
- White House
- William Allen
- William Shinn Sheet Metal Company
- Wilson Sewing Machine Company
- window displays
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