The maintenance engineer will never have seen a model quite like yours before. 
	-- Murphy's Hardware Laws n1
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It is axiomatic that any spares required will have just been discontinued and will be no longer in stock. 
	-- Murphy's Hardware Laws n2
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Any VDU, from the cheapest to the most expensive, will protect a twenty cent fuse by blowing first. 
	-- Murphy's Hardware Laws n3
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Any manufacturer making his warranties dependent upon the device being earthed will only supply power cabling with two wires. 
	-- Murphy's Hardware Laws n4
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If a circuit requires n components, then there will be only n - 1 components in locally-held stocks. 
	-- Murphy's Hardware Laws n5
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A failure in a device will never appear until it has passed final inspection. 
	-- Murphy's Hardware Laws n6
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