August 18, 2016:
- Photo added to SL-4T page.
- Additional information added to A-6 page.
- Additional information and sound samples added to PM-920 page.
- S-25, S-2B, S-2M, S-3K, S-3L, and S-5T tuning updated.
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November 28, 2014:
- Photo added to K3HL page.
- Photo added to Hancock 4700 page.
- A-200 page updated.
- MS-1, A-75, and A-125 pages added.
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December 4, 2013:
- Wabco E-2B-1 page updated.
- Wabco A-6, B-6, and B-7 pages added.
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July 22, 2012:
- Photos and information added to A2 and K2H pages.
- Photos and sounds added to PM920 page.
- Sounds added to K5LLA and K5HL pages.
- K3HL page added.
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July 30, 2009:
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May 21, 2009:
- Updated links on home page.
- Images added to H5 and PM990 pages.
- K5HL page updated, new images and photos.
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May 18, 2007:
- Added sound samples and corrected bell numbers on K5LLA page.
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June 13, 2006:
- Added sound samples to K5LLA page.
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August 31, 2005:
- Added K5HL and K5LLA pages.
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December 27, 2001:
- New samples added to Prime PM-920.
- Modifications to K5H and K5LA pages.
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December 22, 2001:
- Pages added for Wabco AA-1 and AA-2, and Leslie S-5D.
- New samples added to Prime PM-920 and PM-990.
- New photos added to Leslie S-2M and S-3L, and Nathan P5a, K5LA, and K3LA.
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October 28, 2001:
- New samples added to Nathan K3LA, K5LA, and P01235 pages.
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June 10, 2001:
- New samples added to Nathan P3 and Leslie S-3K pages.
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May 15, 2001:
- New samples added to Wabco E2 page.
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April 7, 2001:
- New pictures added to Hancock 4700 and M5 pages. New CSX K5H sample added to K5H page.
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March 23, 2001:
- WABCO E-2B-1 and E-2B-3 pages added. Sample added to Leslie A-200 page.
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October 23, 2000:
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September 29, 2000:
- M3H page added. Reworked M3, K3H/K3L, K3LA/K3HA, and S-5T pages.
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September 22, 2000:
- Sound samples added to SL-4T, H5, P5, and P5a pages.
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July 16, 2000:
- P5a, P01235, S-2B, and S-3J pages added.
- P5 page reconfigured.
- P3 page new samples added.
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July 3, 2000:
- S-3K, S-3L, P3, and K5H pages: reconfigured and new samples added.
- PM-920 and PM-990 pages added to index.
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July 1, 2000:
- Nathan N3 and J3 pages added.
- K5LA page reconfigured.
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June 28, 2000:
- Leslie SL-4T and Airchime H5 pages added.
- M5 page reconfigured.
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May 28, 2000:
- New samples added to WABCo A-2 and AirChime K5H pages.
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April 17, 2000:
- Leslie S-25 and S-2M pages added.
- Pictures of Prime PM-920 and PM-990 horns added to Leslie S-3L and S-3K pages.
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April 15, 2000:
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April 9, 2000:
- New sound samples added to M5 and M3 pages.
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March 14, 2000:
- New photos from Brent Lee added to M5, M3, P5, P3, K3LA, K5LA, S-3K, and S-3L pages.
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February 24, 2000:
- New photos from Brent Lee added to M5, M3, P5, K3H, K3LA, and K5LA pages.
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January 24, 2000:
- Revisions to the various K3 pages.
- New photos from Brent Lee added to K3H, K5H, and S-5T pages.
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December 13, 1999:
- Amtrak K5L and UP K3HA sound samples added.
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October 7, 1999:
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