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2. Sharp PC-4500 - Wikipedia

   en.wikipedia.org/wiki/Sharp_PC-4500

   The Sharp PC-4500 is a line of laptop computers released by Sharp Corporation in 1987. The line comprises the PC-4501, the PC-4502, and the PC-4521. The PC-4501 is a bare-bones unit with only 256 KB of RAM stock, only one floppy drive, no backlighting, and no built-in numeric keypad; the PC-4502 and PC-4521 bumps the stock RAM to 640 KB and includes the latter two features while providing ...

3. St. Louis–San Francisco 4500 - Wikipedia

   en.wikipedia.org/wiki/St._Louis–San_Francisco_4500

   While the Frisco 4500-series 4-8-4s designed to be coal-burning weighed 474,070 lbs (Nos. 4503-4514) and 479,300 lbs (Nos. 4515-4524), oil-burning models like Numbers 4500 to 4502 weighed 464,850 lbs. But the whole series had 74" drivers, 28 x 31 cylinders, a boiler pressure of 250 psi, and a tractive effort of 71,200 pounds. [2]

4. GWR 4500 Class - Wikipedia

   en.wikipedia.org/wiki/GWR_4500_Class

   The first two batches were originally numbered 2161–2190 but were renumbered 4500–4529 during 1912. The first batch (2161–2180) is significant in that it was the last batch of locos built at Stafford Road Works, Wolverhampton . [ 3 ]