http://www.propac.com/packaging-equipment/bagging-sealing/apm/drop-sealers/bag-packager-drop-sealer
http://www.excelpackagingequipment.com/Drop-Sealer-and-Bag-Opener.html
https://www.youtube.com/watch?v=D0NXVIWeSBo
http://www.imbalstock.com/home.php
http://www.doverco.com/index.php?id=240
http://www.palgroup.ca/distributors/machines/sealers_food.html#open
http://www.propac.com/packaging-equipment/bagging-sealing/apm/drop-sealers/bag-packager-drop-sealer
http://www.allpackagingmachinery.com/index.php?option=com_content&view=article&id=63&Itemid=2