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550Hz/440Hz @ 0.5Hz O-O- I -O-O- I 19 107 26 11. 970Hz, 0.5s ON/0.5s OFF x 3/ 1.5s OFF (ISO 8201 Low tone) O-O- I -O- I -O 1 110 19 12. 2850Hz, 0.5s ON/0.5s OFF x 3/1.5s OFF (ISO 8201 High tone) O-O- I -O- I - I 1 112 16 13. 1200Hz – 500Hz @ 1Hz (DIN 33 404) O-O- I - I -O-O 1 110 34 14. 400Hz O-O- I - I -O- I 18 105 21 15. 550Hz, 0.7s/1000Hz, 0.33s O-O- I - I - I -O 1 111 33 16. 1500Hz – 2700Hz @ 3Hz (Vandal Alarm) O - O - I - I - I - I 1 116 46 17. Simulated Bell O-I-O-O-O-O 1 112 26 18. 840Hz