Methods and apparatus for assembling muntin bar lattices and spacer frames for use in insulating glass units are disclosed. One method of assembling a muntin bar lattice in accordance with the present invention comprises the steps of providing a muntin bar segment and a keeper dimensioned for piercing...http://www.google.com.au/patents/US20020104273?utm_source=gb-gplus-sharePatent US20020104273 - Methods and apparatus for manufacturing muntin bar assemblies
