In a casing for accommodating electronic components mounted on a printed circuit board, a lower box has a substantially U-shaped cross section, and includes a floor and at least two side walls. Each of the side walls has a horizontal slot proximate an upper edge thereof. At least one of the side walls...http://www.google.com.au/patents/US4903167?utm_source=gb-gplus-sharePatent US4903167 - Casing for accommodating electric and/or electronic components
